Same settings, same subject, same framing, variable exposure

[kimaldis]

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I'm wondering, has anyone had instances where two takes of the same subject, same framing, same  manual exposure settings but with auto SIO taken within a couple of seconds of each other are taken with very different iso values. It's not happening a lot and at first I put it down to imagination but it's happened enough now that I'm pretty sure it's real.

 

I wondered, maybe, if sometimes it takes a bit of a while for the ISO to adjust and it's firing before the change has been made. Or something.

[Anthonytc]

I will be keen to hear response as I don't have an answer.    

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[a.noctilux]

What's the lighting ?

 

If artificial light, maybe the flicker not seen by eyes can be measure by the cell (adjusted in fraction of second).

 

Spreed of Auto Iso set by the M10 ?

[kimaldis]

What's the lighting ?

 

If artificial light, maybe the flicker not seen by eyes can be measure by the cell (adjusted in fraction of second).

 

Daylight. The lighting is constant.

 

Yes, Auto ISO, manual shutter and, obviously, aperture.

Edited April 12, 2018 by kimaldis

[a.noctilux]

Mystery of AUTO ISO.

 

As old long time film (slides mainly) user, I've never rely on Auto Iso (appeared on M since M9 is nice for "peace of mind use", but I'm not there).

 

I need to control what my pictures would render, so I manual set "every thing to render what I want".

Rely on automation is good but not for me, manual set ISO is something part of my picture control ( "grain on film", pixel noise on sensor and so on), as can be choosing parameters for aperture/speed/focus settings.

 

To master those parameters, you may set yourself ISO, and not worry about "automated settings by the camera intelligence" (which in this case is variable).

 

Your ISO use may differ from me of course, but that's fine.

[enboe]

When using classic metering, the exposure takes a second or so to settle when freshly turned on.

[Flu]

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Are you shooting RF or live view or a mix of both. If using LV, do you punch in with the magnifier to achieve critical focus and take the shot during magnification? If so, this will vary the ISO greatly as you have experienced.

[rnl]

steady iso depends on steady battery voltage.

turn off the LV and see what happens

[kimaldis]

When using classic metering, the exposure takes a second or so to settle when freshly turned on.

And it allows you to take a shot? That wouldn't be so good.

[kimaldis]

steady iso depends on steady battery voltage.

turn off the LV and see what happens

You're assuming I have the live viewer on. I don't. :-)

[kimaldis]

Are you shooting RF or live view or a mix of both. If using LV, do you punch in with the magnifier to achieve critical focus and take the shot during magnification? If so, this will vary the ISO greatly as you have experienced.

No.

[pedaes]

Key question - is the exposure 'incorrect' with different histograms? 

[brill64]

I use auto iso with 'auto power off' switched off & find it very accurate

[paulsydaus]

Can you post some examples?

[keepsabeat]

I have had this happen a number of times on my m10

[sblutter]

Maybe you were using spot metering and the spot it was trained on in the 2nd exposure was different (lighter / darker) than the previous

 

I also advise against using auto ISO.  With experience you should be able to glance at a scene and know what ISO is appropriate.   Obviously this can change quickly:  like moving from indoors to outside.  Very fast to change on 240

 

The only auto I use is shutter speed but am probably 75% full manual.  All settings matter for intentional work.  For fun stuff, who cares?

[klgdigital]

I have a new M10 (month old) and when I shoot at a shutter speed of 1/4000 and motor a few frames, I get wildly different exposures as if the shutter is getting in the way of my image. I have it on manual shutter, manual aperture(of course), and manual ISO. There should be no change in exposure, but in some frames, half the image is blacked out. Frustrating on a new expensive camera. 

[fatihayoglu]

I have a new M10 (month old) and when I shoot at a shutter speed of 1/4000 and motor a few frames, I get wildly different exposures as if the shutter is getting in the way of my image. I have it on manual shutter, manual aperture(of course), and manual ISO. There should be no change in exposure, but in some frames, half the image is blacked out. Frustrating on a new expensive camera. 

 

I guess there was Firmware fix for that. You better check the firmware of your camera and download the new one.