You probably don't know what ISO means

Rick Knepper said:

https://www.dpreview.com/forums/create?type=discussion&forum=1067

This DPR article suggests that different cameras handle ISO differently. I think I remember it being said the GFX is ISO invariant (I don't think the 645z is ISO invariant) but I don't know how to translate that information into finding the least noisy settings as the article suggests doing.

Any thoughts or help for the befuddled?

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calirat said:

my guess is the second one is the higher ISO because it is better lit in the highlights. The first one has darker highlights.

Both shots are relatively well lit. ISO seems to really be a noise issue with low light. With good lighting, high ISO exacts less noise penalty

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lélé said:

Picture 2: https://photos.app.goo.gl/3WYAcHJE5iCmgruP9

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lélé said:

Rick Knepper said:

https://www.dpreview.com/forums/create?type=discussion&forum=1067

This DPR article suggests that different cameras handle ISO differently. I think I remember it being said the GFX is ISO invariant (I don't think the 645z is ISO invariant) but I don't know how to translate that information into finding the least noisy settings as the article suggests doing.

Any thoughts or help for the befuddled?

Click to expand...

Click to expand...

lélé said:

Rick Knepper said:

https://www.dpreview.com/forums/create?type=discussion&forum=1067

This DPR article suggests that different cameras handle ISO differently. I think I remember it being said the GFX is ISO invariant (I don't think the 645z is ISO invariant) but I don't know how to translate that information into finding the least noisy settings as the article suggests doing.

Any thoughts or help for the befuddled?

--
Once you've done fifty, anything less is iffy.

Click to expand...

Let me propose you little game.

Picture 1: https://photos.app.goo.gl/GonXKu42WD4Xjzvu7

Picture 2: https://photos.app.goo.gl/3WYAcHJE5iCmgruP9

Same camera.

Same exposure (same scene, same lighting, same aperture and same shutter speed).

One Picture was taken with the camera set to 'ISO200'.

One picture was taken with the camera set to 'ISO800'.

Same processing (in-camera RAW conversion), same settings, except a -2EV correction was applied to the picture taken with the camera set to 'ISO800' so final pictures brightness is the same.

Which is which? And why?

PS: Please, play fair, don't look at the EXIF.

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JimKasson said:

lélé said:

Rick Knepper said:

https://www.dpreview.com/forums/create?type=discussion&forum=1067

This DPR article suggests that different cameras handle ISO differently. I think I remember it being said the GFX is ISO invariant (I don't think the 645z is ISO invariant) but I don't know how to translate that information into finding the least noisy settings as the article suggests doing.

Any thoughts or help for the befuddled?

--
Once you've done fifty, anything less is iffy.

Click to expand...

Let me propose you little game.

Picture 1: https://photos.app.goo.gl/GonXKu42WD4Xjzvu7

Picture 2: https://photos.app.goo.gl/3WYAcHJE5iCmgruP9

Same camera.

Same exposure (same scene, same lighting, same aperture and same shutter speed).

One Picture was taken with the camera set to 'ISO200'.

One picture was taken with the camera set to 'ISO800'.

Same processing (in-camera RAW conversion), same settings, except a -2EV correction was applied to the picture taken with the camera set to 'ISO800' so final pictures brightness is the same.

Which is which? And why?

PS: Please, play fair, don't look at the EXIF.

Click to expand...

You don’t demonstrate ISO invariance by clipping highlights at high ISO and pulling in post; you do it by “under exposing” at low ISO and pushing in post.



Highlights that the arrow points to have turned gray.

Jim

--
http://blog.kasson.com

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