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Archive 2021 · D850 Auto-ISO issue

joshn
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p.1 #1 · p.1 #1 · D850 Auto-ISO issue

Been shooting with my camera for years now, and haven't touched a thing as I use Auto-ISO with a max ISO of 1600. All of my settings are dialed in and I never touch them.

All of a sudden, starting about a week ago, it just no longer varies the ISO depending on lighting. In the menus there's a setting for the ISO at the very top, and below that menu setting you can change the variables like max ISO and minimum shutter speed, but it's only using whatever I have set at the top of the menu there for the ISO and not varying it, and it's also ignoring my minimum shutter speed setting too.

The result of course is unexpectedly out of focus images all of a sudden, which has literally never been an issue the entire time I've owned this camera. I have no idea what triggered this and have been shooting professional with Nikon for many years, I am not a newbie.

Anyone ever seen this before? Google is of no help, thus I turn to the experts!

pic - https://imgur.com/a/1k7TLun

Nov 30, 2021 at 02:44 PM

MRM4
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p.1 #2 · p.1 #2 · D850 Auto-ISO issue

I ran into that, but it didn't cause anything out of focus. Just some images that were too dark because it kept pegging the bottom end of the Auto ISO range. I finally gave up on figuring it out just set ISO manually. I never had this issue with my D700.

Nov 30, 2021 at 02:53 PM

joshn
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p.1 #3 · p.1 #3 · D850 Auto-ISO issue

Thanks for your reply, so I'm not crazy!?

It was doing two things - using a slow shutter of like 1/90 in a dark place, and/or using ISO 100! Nothing was in focus and I could not understand what was happening.

Nov 30, 2021 at 03:10 PM

Spectro
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p.1 #4 · p.1 #4 · D850 Auto-ISO issue

Does this happen with multiple lenses? The reason I ask is that my old trusty 28-70 2.8 finally died a couple months ago in the middle of a corporate shoot in a dark plant and similar exposure issues happened along with AF failure. I switched to a backup lens and was back in business.

Nov 30, 2021 at 05:12 PM

bernardl
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p.1 #5 · p.1 #5 · D850 Auto-ISO issue

Have you not modified the ISO itself?

Auto ISO will use the set ISO as minimum value.

Nov 30, 2021 at 05:22 PM

gdsf2
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p.1 #6 · p.1 #6 · D850 Auto-ISO issue

Seems you have both the min and max ISO set to 1600. Therefore it will always be 1600.

Nov 30, 2021 at 05:45 PM

joshn
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p.1 #7 · p.1 #7 · D850 Auto-ISO issue

I had to set it at 1600 because when I set it to anything lower, it would use THAT value every time, and never go higher. It's the crux of my issue.

Nov 30, 2021 at 08:06 PM

sjms
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p.1 #8 · p.1 #8 · D850 Auto-ISO issue

The top should be the baseline iso you want to use as your iso with auto iso off or on and for me is generally 64.
If you set the top line to any other value that becomes your baseline in auto iso on or the only iso with it off.

So the question is simple what baseline iso do you want to have?

Top selection 64 with auto off and you are shooting at iso 64 all the time

Top selection 64 and max sensitivity set to 1600 with auto iso on the camera will choose the appropriate iso based on the light conditions and the aperture and speed values selected depending on your shooting mode.

If you choose to use the iso button behind your shutter release even with auto iso on it will change your baseline iso only.

You also have your minimum shutter speed that you want to use in auto that will try to be maintained in use. I have gone below that many times because of the iso latitude I give the camera and where and how I shoot.

sometimes you are in locations where tripods are more than frowned upon so you suck it up and take the shot. then there is the post hail mary play

f4

Edited on Nov 30, 2021 at 09:38 PM · View previous versions

Nov 30, 2021 at 08:43 PM

jbledsoe
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p.1 #9 · p.1 #9 · D850 Auto-ISO issue

My first question would be, what mode are you using? (Test in manual)
Next, did you verify exposure compensation is set to zero?
Next do you have a setting locked?

If not in manual and/or one of these you might see this under the right conditions.

A quick test. Do a configuration backup, factory reset. Verify it took. Do NOT format the card with your backup.
Set to manual mode and zero exposure.
Enable auto iso with default low and high or say 100 and 3200.
Either change subjects or if locked on a tripod, simply change either speed or aperture and see if the iso changes.

If no, likely need to get it fixed.

If yes, your saved configuration has a setting that is causing your issue, import your configuration and find/fix it OR set your preferred settings and verify auto iso still works, if yes, get a configuration backup and save it off card so you can simply restore it in the future as needed.

You stated your photos were out of focus. I'm assuming you mean you had a focus lock but the speed was so low that you ended up with blurry photos due to movement. Remember if you are shooting in aperture mode with auto iso enabled, I believe it will always adjust speed before iso. This is one reason to test your issue in manual mode. Isolate away from the variables ;-)

This might help, it shows rules and behaviors for auto iso on your d850.
https://onlinemanual.nikonimglib.com/d850/en/10_iso_sensitivity_02.html

Dec 01, 2021 at 12:35 AM

MRM4
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p.1 #10 · p.1 #10 · D850 Auto-ISO issue

I set the minimum shutter speed in the auto ISO settings to Auto and it seems to have fixed it. I attempted to shoot a middle school basketball game and none of the shots ever hit the minimum (I purposely left it at 400 just for a contrast). I'll continue to test that out.

Dec 15, 2021 at 10:59 AM

MRM4
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p.1 #11 · p.1 #11 · D850 Auto-ISO issue

I am still getting the auto ISO to work while having the minimum shutter speed set to AUTO. You might try that and see if you get the results you're looking for.

Mar 09, 2022 at 08:25 AM


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