Natural Exposures, Inc. Welcome to our world of wildlife Fri, 23 Jun 2017 09:38:44 +0000 en-US hourly 1 90305722 Lumix LX10 Takes a Licking Keeps On Clicking! Fri, 23 Jun 2017 09:33:42 +0000 Read More »


For our recent Invitational Photo Tours to Europe, I brought along two of Panasonic’s so-called Point and Shoot cameras, the Lumix ZS100 and the Lumix LX10. I plan to write more about them both in a later post but I wanted to share one experience that took place a couple of days ago that’s truly impressive.  I won’t spill the beans so to speak but will say that the LX10 proved what I’ve been saying since I began shooting Lumix cameras, “Lumix cameras are incredibly tough”. You’ll have to watch the video to see the details. Would like to hear from any others with similar durability, or not, stories of Lumix cameras in the comments below. Let me know what you think.

A pretty big “Ding” in the lens barrel after it rolled 40 meters down hill. The lens was extended out as it is in this photo so it wasn’t’ protected when the roll started. Somewhere along the li, e the camera’s lens retracted, on its own, possibly saving itself from more damage. Thaks to NE Explorer Freddy Kurtz for shooting the stills of this camera for me. 

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Question from Steve Henry Sun, 18 Jun 2017 06:23:07 +0000 Read More »


So, Dan… Our grandson is going to be 13 this fall. He makes nice photos with his cell phone but would like to have some better equipment. Time for him to learn about f-stops. Any recommendations for a small, good, carry-around camera as a starter for him? Might that also apply to me? My venerable, but ancient Canon Powershot G11 is on its last legs. Best wishes. Steve (and Linda) Henry

This image was shot with the LX10

Great question Steve. It just so happens that I’ve been traveling around Europe the past month–with three weeks left to go–shooting two of the Lumix so-called, Point and Shoots. I say “so-called” since the quality out of these two cameras, the Lumix LX 10 and the Lumix ZS100 is hard to believe. The LX10 is probably the one I would be most inclined to recommend since it has a very fast lens that is equivalent to 24mm-72mm F/1.4-F/2.8. It also has an aperture ring which could be advantageous for learning about how the aperture works for your grandson. The ZS100 is a bit more automated but does have a longer, albeit slower lens which is equivalent to 24mm-280mm. It also has a very small, mediocre, built in EVF. But it does have one where the LX10 has none and all viewing is done via the back LCD, iPhone style.

Both cameras have flash and full Program, Aperture, Shutter and Manual priority controls. Both shoot RAW AND both shoot 4K video. The list of features goes on and on and the quality of the images is exceptional. The battery on each is nothing to write home about but both have the advantage of being able to plug the camera into a USB port for charging. That’s a nice feature. I’ve been using the ZS100 for over a year. It’s been dropped, banged and taken lots of abuse and has not once given me any issues.

Let me know if you have any further questions. Great hearing from you and say hello to Linda.

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Question from Jimmy Hendricks Sat, 10 Jun 2017 13:04:06 +0000 Read More »


Hi. I have recently purchased a Lumix G 85. It came with the 12 -60 kit lens. I’m wanting to get a faster lens for photography and video. I was thinking about getting the Lumix 25 mm 1.7 prime lens. I’m getting ready to take a family Picture with 20 people in it do you think that 25mm would work or is there a better choice that would serve me better in the long run.



Since you asked my opinion I’ll tell you what I think of the 25mm. I’m not a fan. No fault of the quality of that lens, I just don’t see in 50mm format. If I were to purchase an all around great portrait like lens, it would be either the 12-35mm F/2.8 or the new Leica 12-60mm. Both give you considerably more options when it comes to lens variation and both are extremely sharp. The 50mm is, in my opinion, very limited. Not sure this will help you a great deal which I apologize for but it really boils down to personal preference. I can tell you the 50mm would do a fine job with a group of twenty people.


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Nature Photography Day June 15th – Spread The Word Fri, 09 Jun 2017 06:09:02 +0000 Read More »


The North Ameican Nature Photography Association (NANPA) is once again sponsoring their annual Nature Photography Day. It happens June 15th and gives all nature lovers the opportunity to enter their photo contest which has great prizes from some of the industry’s most popular companies. NANPA’s description of the event is below.

About Nature Photography Day

A dozen years later, enthusiasm for Nature Photography Day has grown worldwide. This day is designated by NANPA to promote the enjoyment of nature photography and to explain how images have been used to advance the cause of conservation and protect plants, wildlife, and landscapes locally and worldwide.


In 2006, NANPA celebrated the first Nature Photography Day and placed it in McGraw-Hill’s reference work, Chases’s Calendar of Events. Many media and websites took notice. Since then, people throughout the North American continent–from overseas, too–have discovered numerous ways to observe and enjoy the day.

NANPA encourages people everywhere to enjoy the day by using a camera to explore the natural world. A backyard, park, or other places close by can be just right. Walking, hiking, and riding a bike to take photos are activities that don’t lead to a carbon footprint. And fresh air can do wonders for the spirit!

Get Out Your Cameras and Take Photos!

So grab your cameras and get out and document this amazing planet we call Mother Earth. It’s not just a fun thing to do, but it’s important to share your views with others, which help us all to understand the need for conservation and sustainability. Happy shooting.

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Could the Nikon Rumors Be True? Wed, 07 Jun 2017 12:33:24 +0000 Read More »


Could the Nikon rumors be true? If so it’s very sad, but one that is making its way around the Internet that suggests the Japanese government is trying to broker a deal between Nikon and Fuji. It first appeared on Fuji Rumors, a sister site to 43Rumors. The story, by Japanese news site Sentaku, discusses the many issues Nikon has faced over the past ten years that’s created their difficult situation. Additional sources suggest Fuji is being pressured to buy a substantial stake in Nikon to make sure it’s not purchased by other non-Japanese entities.

Those who travel with us know that I’ve been predicting something like this since about 2008 when I first started shooting the Lumix MFT system. I had been a Nikon user for over 35 years, and during that time had built a strong relationship with the great folks working in Melville, NY. Even so, during that long relationship, there were many, many times I suggested an idea or a need for something to make my photography more productive and every suggestion was met with the comment, “You don’t need that.” No, I’m not joking.

We Know Best

Here’s an example. Back in the late 80’s, I was working on my Black Bear book, and in 1988 Nikon released their newly developed 80-200mm AF zoom. I had been using their original 80-200mm manual focus zoom for several years and it was my favorite lens. That original 80-200mm manual focus zoom had a tripod collar, but the new AF version had been designed without one. Admittedly, the new AF version was much, much smaller than the older manual one, but the new AF lens was extremely heavy and impossible to control when attached to a camera, connected to a tripod. It was extremely unbalanced when shooting horizontal and when I wanted to go vertical, forget it. It was impossible.  During a conversation with Nikon’s NPS representative I mentioned this issue and his exact words were, “Well, you don’t need one.” Are you kidding me, I thought? At that exact time, I was busy working on a project that involved a black subject (black bears) under a heavily canopied forest in northern Minnesota, shooting Kodachrome 64 film, and I was told I didn’t need a lens with a tripod collar. Shortly thereafter Canon announced their new 80-200mm that had a tripod collar you could remove. Imagine that. Somebody giving the photographer a choice.  That’s just one example of Nikon always knowing better than the photographer about what he or she did or didn’t need.


Nikon lens table courtesy of Ken Rockwell. Click on the image to see more on Ken’s website.

I have to say I had a great run with Nikon, and I hope whatever happens, the name will always be around. But I can’t say enough about the difference in attitude of one company over another. My time working with Panasonic has been an open door with lots of interest on their part for how they can do things better. With Panasonic, you’re made to feel like you’re part of a team and not just one of many. Nikon has always made great products, but they’ve often been last to the game or at least very late. In the 90’s I should have switched to Canon due to Canon’s superior AF. Nikon eventually caught them but it took at least ten years. Lets not even talk about Image Stabilization.

Too Long to Market

Nikon has always been proud of the length of time it takes them to come to market with a product. Their belief has always been to take their time and do it right. But it didn’t always work that way. Does anyone else recall the first Nikkor 300mm F/2.8 AF lens? It was shaft driven. Canon’s had the motors in the lens. Nikon eventually, over a period of several years—as many as ten—released 3-4 versions of the 300mm F/2.8, eventually accepting that the best way to do a lens of this type was using motors in the lens.

In today’s fast-moving world of technology, you can’t wait years, especially ten, and then release an inferior product. The market will kill you. It’s sad to say, but unfortunately, Nikon is finally losing the argument that they always knew best AND that customers be damned, they’ll take their own sweet time to do it right, even if they fail. Not a pretty sight, but to be quite honest I’m not surprised. Very sad.


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Anurag Agnihotri Wonders, Leica 100-400mm or Olympus 300mm F/4? Sat, 03 Jun 2017 17:43:59 +0000 Read More »


Hi Dan
Lovely blog and great pictures.
I am planning to get into M43 system and there is one question i wanted to ask. Panasonic zoom 100-400 or Olympus 300 F4 ? You have used them both right?
Also want your inputs on the zoom stiffness problem that i see mentioned everywhere on the net. Has it been rectified, or is it not a problem at all to begin with…
Regards and appreciation,

Anurag, First of all, please accept my apology for taking so long to answer this great question. I’ve been running behind on answering ” Questions for Dan” due to my travel schedule and a glitch in our Blog software. We have the software glitch figured out so I’m confident I’ll be able to do a better job in the future.

Regarding which lens would I recommend, the Leica 100-400mm or the Olympus 30mm F/4? That’s a great question since both have their pluses and minuses. I’m actually a good one to ask since I bought and regularly use both. I will say that due to the convenience of the 100-400mm’s multiple focal lengths, I most often reach for that lens. However, there are times, typically when the light is less than ideal, I first reach for the faster Olympus. Below is a list of the Pros and Cons to each,

Leica 100-400mm


  • Multiple focal lengths from 200-800mm equivalent
  • Relatively lightweight and compact for the magnification is provides
  • Very sharp
  • Dual IS with Lumix GH5 and G85 cameras
  • Very high-quality build
  • Relatively inexpensive compared to Olympus  and any major brand lens in the 600-800mm range


  • Slow maximum aperture of F/6.3 at 400mm (800mm equivalent) Not great in poor light.
  • Stiff zoom mechanism
  • Tripod collar that only rotates 45 degrees. Great for verticals one direction but not the other
  • Image stabilization switch is easy to accidentally switch off.  I tape mine. It could use a lock button.

Olympus 300mm F/4


  • Equivalent to a 600mm F/4 at a 30mm F/4 size
  • Relatively lightweight and compact for the magnification is provides
  • Extremely sharp!
  • Can use Olympus 1.4X teleconverter that is also very sharp with 30mm F/4. Gives you 840mm equivalent


  • $700.00US more expensive than 100-400m
  • No ability to have multiple focal lengths like zoom has.

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Tristan Piat Wants to Know Which Tripod Head for Action Mon, 29 May 2017 10:42:37 +0000 Read More »


Hi Dan,

I just had my first serious weekend of shooting Australian wildlife, in particular, kangaroos and a range of birds with a gx8 + Leica 100400. When filming I used my uncle’s tripod which was difficult to swivel easily and struggled with holding still under the weight of the big lens. Do you have recommendations on the type of tripod to work with when filming fast-paced shots such as birds in flight? I also do a bit of surf photography so something that works with both types of subjects.

Secondly, what video recording settings do you use when filming wildlife movement?

Many thanks in advance.



For birds in flight with the 100-400mm I no longer use a tripod with ay of the Lumix cameras I use that lens with. With DualIS the days are gone for needing a tripod in my opinion. By getting off tripod you can follow action much more freely. The key to great action technique is to use as fast of shutter speed as possible. If you really feel you want to use a tripod I would recommend the Kirk B1 which I have used for many years. It’s a ball head and moves very smoothly for action, but like I said, I have one of these heads and almost never use it any longer.

This photo shows me shooting the new Leica 100-400mm with the Lumix GX8 on birds. I shot the entire advertising campaign for this lens handheld, almost all subjects were birds in flight.

As far as video settings, that’s a long answer depending on what you want to accomplish. Are you wanting to produce high-quality video for actual video use or are you wanting to pull stills from that video? If you can give me more info on what you plan to do with the video I can be more specific.

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Laurie Dippold Which Zoom Leica or Olympus? Sat, 27 May 2017 14:46:17 +0000 Read More »


I’ve long wanted an MFT lens that’s comparable in zoom range and aperture to the Canon L powerhorse, 24-105–it’s what I missed most when I switched to MFT from Canon. And it looks like this year, we finally have some options! Any thoughts about (or experience with) the forthcoming Panasonic Leica 12-60 f/2.8-4 vs. the Olympus M. Zuiko 12-100 f/4?

Laurie, first let me apologize for the length of time it takes to answer your question. Trying to get a better system setup for me to get to these questions quicker. I sincerely apologize.

St. Blasius Church in the heart of the old city of Dubrovnik, Croatia. Shot with the Lumix GH5 and Leica 12-60mm lens.

The good news is that due to the length of time it’s been, I actually have some real world experience with both the lenses you ask about. I’m planning to do a review comparing the Olympus 12-100mm and the new Leica 12-60mm you mention above. I’ve shot the Olympus briefly, and it is spectacular. I’ve ben using the Leica extensively the past two weeks while in Europe and can’t say enough positive things about this lens. I absolutely love the range and find it to be extremely sharp. I haven’t’ done any actual lens chart tests with it but the images I’m getting are stunning, to say the least.

Seascape with the local lighthouse just off the coast of Rovinj, Croatia. Lumix G85 with Olympus 12-100mm lens.

I have had several of our Natural Exposures Explorers show up with the Olympus and they absolutely love that lens as well. My only concern is the weight of the Olympus. It’s big! Admittedly, if you take into account that it replaces so many other lenses you would no longer have to carry, it might not be an issue. But…. I found it to be quite large and heavy to carry as an all day lens. I’ve found that for 90% of my shooting I’m not missing anything longer than the 120mm equivalent the Leica gives me at 60mm

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G. J. Griffiths Wants to License Photo Sat, 27 May 2017 14:08:28 +0000 Read More »


Hi Daniel,

I was recently looking via Google for “free grizzly bear pictures” and up popped the one I wanted. It is a grizzly bear standing on its hind legs in a forest clearing. I wish to use it on the cover of a book that I recently completed. Although it was not obvious on that site I discovered that it is one taken by your talented self. My question is would you object if it is credited inside the flyleaf with your name, along the lines of “cover picture taken by Daniel J. Cox the distinguished wildlife photographer” ?

Incidentally my first 35mm camera was also a Mamiya Sekor, with which I took my best sunset for many years! I eventually wound up with Nikon equipment and was at one time a field sales manager for Mamiya 645 and 6×7. There was a time – wildlife photography… oh well… Anyway, I am now a retired science teacher who writes books.
Many thanks if you have time to reply,

Graham, sorry for the late reply. The best way to get information on the licensing of my photography is to contact my office directly at If you are still interested in using this image I can have my office contact you. There would be a licensing fee based on how many copies book will be printed. Let us know if you’re still interested at the email above and we’ll see what we can work out.

By the way, I’m not sure how this image came up under Free Grizzly Bear Images since I charge some amount of money for all my work other than what I do for Polar Bears International. I appreciate you informing me about this and will take a look.

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Mike Cromwell Suggests Firmware Update Information Sat, 27 May 2017 13:46:21 +0000


Now that the GH5 deliveries are about to start and people who have not yet upgraded the firmware of their Panasonic lenses with Power OIS (mostly the 12-35 and the 35-100) will be more interested in upgrading the firmware for their lenses to work with the dual IBIS of the GH5, I thought that I would make one addition to your great upgrade posts. This is based on my own experience.

If anyone using Chrome clicks on the upgrade links and nothing happens, you should check whether you have the browser set to block popups. Go to your browser settings, click on advanced settings, under the privacy section click on the content settings button. This will show you your pop up settings.


Thaks for your input Mike. Here’s a link to the post you were referring to for those tha need help with Firmware Updarte

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Paul Ross Asks When Will GX8 Replacement Arrive? Sat, 27 May 2017 13:44:09 +0000 Read More »


Followed you and bought the Panasonic 100-400 lens, love it. Bought the Panasonic GX8 to go with the lens. and love that too. For wildlife, this is as good as it gets. Now I would like to think about the future and I wonder if there is going to be a GX9? I looked at the GH5 but, for me, its too video centric and too large and heavy for a m43 camera. I use the Pana lens for wildlife and for landscape I use a Nikon d810. So, I need to ask, what rumblings might be coming from Panasonic concerning a replacement of the GX8? What about size, weight, IQ, sensor size, sensor type, and feature like HDR, focus stacking (ala Olympus), etc.,etc. What should we WISH FOR and finally when might we expect to hear about the replacement for the GX8? I am forever hopeful that Panasonic will deliver a camera to replace the GX8 that improves upon it in every way, but is focused on photography not video.


Paul, sorry for the delay in getting back to you. Unfortunately, I’ve not heard a word about the successor to the GX8 but I’m certain there will be something. All the options you mention, HDR, Focus stacking and others are things many of us working with Panasonic have requested as well and they’re very good at listening, so I’m hopeful those will be coming. However, Panasonic does not give any of us insight as to what’s for certain and if they did, I’m sure they wouldn’t want me posting it on a Blog. Sorry, I can’t be more help but stay tuned to the Blog for news about upcoming products.

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Christopher Bowyer Asks About Sharpness of Leica 12-60mm Sat, 27 May 2017 13:36:24 +0000 Read More »


Dear Daniel,

I hope you don’t mind me contacting you to ask for your advice please.

I’m longtime Nikon DSLR photographer but am intending to switch to mirrorless, mainly for more accurate AF and smaller/lighter equipment. To this end, after much reading of reviews etc, I recently purchased a Panasonic G80 & Panasonic Leica 12-60mm f/2.8-4 lens.

When this arrived I unpacked it, set the camera up and did quick test taking some photos of a brick wall from square on to check the camera & lens worked fine. It was pretty fine at most focal lengths, but unfortunately, the lens was very soft in the bottom LH corner at 60mm, as can be seen in the screenshot here

I reported this to the camera shop who were very apologetic and asked me to send the lens back for a replacement. I did, and the replacement arrived a few days later.

I unpacked the replacement lens and tested it, it was fine at 60mm (phew!) but had very soft bottom RH corner at 50mm, shown in this screenshot

I’ve contacted the camera shop about the second lens, but haven’t had a reply yet.

With your experience with Panasonic cameras & lenses, do you have any advice for what to do next, please?

I mean, I really like the Panasonic G80 camera body, I much prefer it to my Nikon D7200. But I’ve never had such a problem as this when buying Nikon lenses in the past! Is it usual to have to try several copies of a Panasonic lens to find one that is all right?

It did cross my mind that it might be my G80 camera body that was at fault, but it works fine with a friend’s PanaLeica 25mm f/1.4 lens, and wasn’t too bad with the 12-60mm lenses except at the 50/60mm focal lengths. So it doesn’t seem to me that it is the camera that is at fault?

I’ve uploaded some full-res photos here if you would like to look at them in greater detail.

Any help or advice you are able to offer would be most gratefully appreciated. I’m keen to make the switch from Nikon to Panasonic, but need to sort out this issue with the lens first!

Kind regards,


Christopher, Sorry for the late reply. Have been on the road extensively and having one heck of a time keeping up with all the Blog produces.

I’m sorry to hear you’re having issues with this lens. I tried downloading the image you sent a link to but see tha the link has expired. I would be happy to check those out if you have a new, current link. Were you ablet to reslove this issue by any chance. If not, are you in the US? If so we can possibly get you intouch with the right people to check this all out. Let me know when you can and please accept my aplogy for taking so long to respond.


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Chris Sawtell Asks if Leica 42.5 Sharper with IBIS or OIS Sat, 27 May 2017 13:25:51 +0000 Read More »


Hi Dan – Really enjoy your real world reviews and wonder if you can give me any insight into whether the Pana leica Nocticron 42.5mm f1.2 is sharper on the 16mp G85 with the dual IS than on the 20 mp Olympus EM1 Mark 2 using body only IS? An article by Lloyd Chambers on rated the Oly Em1 Mark2 (IS on) plus Pana Leica Nocticron (dual OIS won’t work with Oly bodies) as outstanding – and even better than Leica SL and others with reputations for great IQ. Best – Chris

Chris, sorry for the late reply. Unfortunately, I’ve not shot the 42.5mm Leica on the Olympus body at this time.  Therefore, I’m unable to make a comment on which camera would give you better images. There’s no doubt that the Dual IS is a tremendous advantage but it’s also true that Olympus does a fabulous job with In Body IS, even without the benefit of additional In Lens IS/OIS. I’m hoping to do dig into this a bit later to see for myself. Sorry, I can’t be more help but stay tuned for further tests.

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Mark Kaprielian Asks, Do I Use Third Party Batteries? Sat, 27 May 2017 13:12:50 +0000 Read More »


Hello Dan

Panasonic and compatible batteries:

I’ve had a number of different Panasonic cameras and they’ve all frustrated me battery wise. Currently I have a G85 and a G7 which both use the BLC-12 batteries.

The Batteries from Panasonic do seem to hold up the best but are always in the $50 to $60 range.
For BLC-12 I’ve tried Kastar, Wasabi, DTSE and Dot-01

When I had only one camera using this battery my strategy was have at least two Panasonics and four or more of some other cheaper brand. Always use one Panasonic as my primary battery and have other brand in the camera bag. Leave the other Panasonic and other brands in the charger ready to swap out after a shoot so I’m ready to go with the bag.

Now I’m taking both my cameras and while I have a lot of the alternate vendor batteries I’m faced with buying two more expensive Panasonics so I can have both cameras with bags ready to go, especially since I now take along both on many shoots to avoid lens changes.

The newest alternate vendor batteries always seem to hold charges when not in use better and last a decent amount of time in the cameras but over time, say 6 months, they become like all the previous attempts at finding a reliable brand. Thus, how and why I’ve tried all the vendors I listed above. I see people all the time on say DP review say they have good fortune with the very brands I’ve tried but for me, 6 months or so down the road, all but the Panasonics clearly degrade in the ability to hold charge when not in use and last for a lot less shots. I do make a point of rotating their use all the time so they are all getting about the same use.

No sites seem to compare between makers and in the end, all but the Panasonic don’t hold up. I would have thought one of these alternate vendors managed to get the same manufacturer as Panasonic and branded them as their own but apparently Panasonic has that locked up or has some exacting specs to get the best of the product runs.

I think I’m like many feeling that the price of the Panasonic batteries is too high yet I/we do seem to get what we pay for.

At last I get to my questions:

1 – Do you use any non-Panasonic brands that you might suggest?
2 – Do you make sure you always have a few Panasonics with you on a shoot as I do?
3 – What is your spare battery strategy, e.g. 1 camera N batteries, 2 cameras (that use the same battery) M batteries and what mix of brands if not all the same.

4 – Any advice on the topic of batteries and alternate vendors. e.g. Does any particular model of Panasonic really detect and behave differently if not a Panasonic battery?

Please consider asking Panasonic if they can do something about the price. If they were say half the current price which would put them at double the alternate vendors, at this point I’d buy a whole bunch of Panasonic and throw out the rest. They might find their volumes go up due to people like me who are tired of the bulk low cost batteries.


Hello Mark, Sorry for the delay in answering this question. In short, I don’t use third party batteries of any kind. I’m a firm believer in getting what you pay for and though I too wish the Lumix batteries were cheaper, I don’t feel the possibility of having dead batteries is worth the savings you get from buying non-Panasonic varieties.

I typically have two-three batteries with me for whatever camera I’m shooting. I long for the days of my Nikons where I could use one battery for as many as three days but the other benefits of the Lumix cameras are worth the tradeoff in battery consumption.

On a typical day, I shoot for 2-4 hours in the AM and 2-3 hours in the PM as I’ve been doing the past two weeks in Europe. Quite often, I won’t even use one battery per morning or afternoon/early evening shoot but if I do I have the one spare. When I get back to my hotel room, I immediately put the battery I used for that morning on the charger and by the time I want to shoot later in the afternoon/evening it’s ready to go again.

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Richard Barbour Asks Why Turn Off Shutter AF When Using Back Button AF? Sat, 27 May 2017 12:36:49 +0000 Read More »


Hi Dan,
I’ve had the G85 for a short time and enjoyed reading your review, especially the explanations of the various settings you use. I also like to use back-button focus, but not all of the time, so I was confused by your settings where you say to set “Shutter AF” to OFF. I have it set to ON, and back-button focus works fine when I use it, but otherwise, the focus will lock when I half-press the shutter. This lets me have it either way; am I missing something?

AF/AE Lock button that is setup on the GH5 for Back Button AF.

Richard, the reason I set “Shutter AF” to OFF is due to the fact that, yes, the back button will also initiate AF but having both Shuter Button focusing AND the Back Button Focusing, they negate each other. The reason we use Back Button AF is to separate focus activation from the shutter button. The reason for using Back Button AF is to be able to focus on a subject, recompose the frame since most subjects won’t appear directly behind the AF sensor. Now that you have focused on the subject and recomposed, the AF sensor may be far from the specific subject you want in focus. You have to push the Shutter button to take the photo and if you have Shutter AF-ON, it now refocuses on whatever the sensor is pointing at. By turning Shutter AF off you no longer have to worry about the camera refocusing AFTER you have focused on the subject you actually want.  In short, having both Back Button AF on and Shutter AF-ON, they fight each other and completely negate the benefit of either one. Let me now if this is as clear as mud. I’ll try it gain if needed. Hope this helps. Sorry for the long delay in answering this.

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