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Is it me, or is it the camera?
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May 9, 2019 12:06:48   #
Dziadzi Loc: Wilkes-Barre, PA
 
I took these photos yesterday at my grandson’s high school baseball game. I had my D7100 set up just like Nasim Manusurov recommended. Specifically Shutter Priority and auto-iso. The day was a clear blue sky at about 5p.m. EDT. For whatever reason, the ISO (though I didn’t include all the photos taken) is all over the place. Even the some of the RAW photos show under-exposure. I shoot RAW+JPEG and ususally convert the RAW to JPEG using Photoshop.

So, my question to you guys and gals is: “Am I doing something wrong, or is the camera in need of an adjustment/repair?” I hope that the metadata lends some information to help you help me.

Your thoughts and consideration are appreciated.

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May 9, 2019 12:26:02   #
tommystrat Loc: Bigfork, Montana
 
It appears to me that you were using spot metering, which would possibly explain why the ISO was so jumpy. Perhaps center-weighted metering would be more appropriate, especially when shooting action shots. Just my thought, and I could be mistaken...

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May 9, 2019 12:35:07   #
Linda From Maine Loc: Yakima, Washington
 
The first says was shot in auto ISO at ISO 3200.

The second says ISO 160 and is badly under-exposed when viewing the raw. But there is no label as being in auto-ISO. Is it possible you inadvertently changed the ISO from auto to a value? With my two newest cameras (Panasonic and Olympus mirrorless), it happens a lot with the two knobs on top, shutter speed and aperture.

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May 9, 2019 12:54:50   #
Dziadzi Loc: Wilkes-Barre, PA
 
Linda From Maine wrote:
The first says was shot in auto ISO at ISO 3200.

The second says ISO 160 and is badly under-exposed when viewing the raw. But there is no label as being in auto-ISO. Is it possible you inadvertently changed the ISO from auto to a value? With my two newest cameras (Panasonic and Olympus mirrorless), it happens a lot with the two knobs on top, shutter speed and aperture.


Thanks for your observation, Linda. As I look at the metadata for the photos taken yesterday, I do not see "auto-ISO" on any of them. Where might I find that "label"?

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May 9, 2019 13:00:24   #
rmorrison1116 Loc: Near Valley Forge, Pennsylvania
 
My guess is the uniform is confusing the camera. A similar effect when shooting in snow.

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May 9, 2019 13:09:31   #
Linda From Maine Loc: Yakima, Washington
 
Dziadzi wrote:
Thanks for your observation, Linda. As I look at the metadata for the photos taken yesterday, I do not see "auto-ISO" on any of them. Where might I find that "label"?
I found it via the site linked below, which has far more info than I have a clue how to interpret
https://www.get-metadata.com/

In the little Chrome browser extension exif reader I have, it simply gives the ISO value.

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May 9, 2019 13:16:42   #
CHG_CANON Loc: the Windy City
 
I'm with Linda on the spot metering observation. Was this also part of the Nasim configuration?

Take the first JPEG. If the 'spot' was the white pants, that would be a different reading / metering than the dark jersey against a shaded background.

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May 9, 2019 13:18:06   #
Linda From Maine Loc: Yakima, Washington
 
CHG_CANON wrote:
I'm with Linda on the spot metering observation. Was this also part of the Nasim configuration?

Take the first JPEG. If the 'spot' was the white pants, that would be a different reading / metering than the dark jersey against a shaded background.
That was Tommy's contribution; I'm still stuck on ISO... auto or no

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May 9, 2019 13:26:29   #
CHG_CANON Loc: the Windy City
 
Linda From Maine wrote:
That was Tommy's contribution; I'm still stuck on ISO... auto or no


Dump the EXIF from the NEF files. The Adobe processing has stripped some of the Nikon EXIF when the JPEG was created.

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May 9, 2019 13:32:08   #
Dziadzi Loc: Wilkes-Barre, PA
 
Thanks for the link, Linda. I went to it and uploaded the RAW file. I don't see anything about "auto-ISO" being on or off.

I don't know if the link of the results will work here, but here it is: https://www.get-metadata.com/result/cd37e6eb-d99d-45b0-8c97-f1840aaad809

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May 9, 2019 13:36:36   #
CHG_CANON Loc: the Windy City
 
The first NEF reports AUTO ISO, the image at ISO-3200. The 2nd NEF reports a fixed ISO at ISO-160.

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May 9, 2019 13:37:13   #
RV Loc: Chicago
 
If using spot metering, as someone earlier suggested, the iso could be changing due to metering on a different light source on the image each time you shoot. The uniform, or the face etc. Having been a sports photographer you can certainly leave it on shutter priority. If you want to stay in auto iso, make sure you spot focus on the same point of the subject every time. Or (preferably) turn on multi-point focusing for an overall average of the light giving you a more consistent reading. The lens you use will also have a big effect on your iso as well especially shooting on a cloudy day or night game.

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May 9, 2019 13:46:37   #
Dziadzi Loc: Wilkes-Barre, PA
 
CHG_CANON wrote:
The first NEF reports AUTO ISO, the image at ISO-3200. The 2nd NEF reports a fixed ISO at ISO-160.


Thanks, CHG. I wish I knew if the auto-ISO was on or off for those shots which are underexposed.

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May 9, 2019 13:47:50   #
Dziadzi Loc: Wilkes-Barre, PA
 
RV wrote:
If using spot metering, as someone earlier suggested, the iso could be changing due to metering on a different light source on the image each time you shoot. The uniform, or the face etc. Having been a sports photographer you can certainly leave it on shutter priority. If you want to stay in auto iso, make sure you spot focus on the same point of the subject every time. Or (preferably) turn on multi-point focusing for an overall average of the light giving you a more consistent reading. The lens you use will also have a big effect on your iso as well especially shooting on a cloudy day or night game.
If using spot metering, as someone earlier suggest... (show quote)


Thanks, RV. I would appreciate your input on what metering you would recommend.

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May 9, 2019 13:50:03   #
Dziadzi Loc: Wilkes-Barre, PA
 
CHG_CANON wrote:
I'm with Linda on the spot metering observation. Was this also part of the Nasim configuration?

Take the first JPEG. If the 'spot' was the white pants, that would be a different reading / metering than the dark jersey against a shaded background.


Nasim's article did not suggest anything to do with the metering. I would appreciated hearing your suggestion, CHG.

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