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zanz34

Barnegat, US
191 posts

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zanz34 Silver Member Nikonian since 11th Sep 2008
Mon 12-Nov-12 10:31 PM

I've been shooting using Auto ISO and have experienced ISO settings which seem a bit off the norm. For example, I've seen ISO values like 8,069 and 10,159 rather than the nice even numbers like 6,400/8,000/10,000. Is this a new occurrence with the newer Nikons (D-600/800/D4)? I'm not concerned, just would like to have a better understanding of the situation.

Bob Z.

jamesvoortman

Durban, ZA
1479 posts

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#1. "RE: Auto ISO Settings" | In response to Reply # 0

jamesvoortman Silver Member Nikonian since 06th Sep 2004
Tue 13-Nov-12 02:25 AM

8069 is 1/3 stop more than 6400 (100 x (2^6.3333) This would be HI 0.3 on the D800 being 6 1/3 stops faster than ISO 100.

10159 is 2/3 stop more than 6400 (100 x (2^6.6667) This would be HI 0.7 on the D800 being 6 2/3 stops faster than ISO 100

I'm guessing your camera is set to adjust ISO in steps of 1/3 stop. Nikon may not be applying rounding to the numbers.

My D800 shows HI 0.3 and HI 0.7 in both displays and in the info screens on playback when using these settings. I assume you are seeing this ISO in your post-processing software?

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Antero52

Vantaa, FI
2683 posts

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#2. "RE: Auto ISO Settings" | In response to Reply # 0

Antero52 Silver Member Awarded for his expertise in post-processing, being  consistently helpful and professional. Nikonian since 07th Jul 2009
Tue 13-Nov-12 05:41 AM

I believe one of my D90 books said Auto-ISO can apply values that aren't selectable manually.

Regards, Antero

zanz34

Barnegat, US
191 posts

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#3. "RE: Auto ISO Settings" | In response to Reply # 2

zanz34 Silver Member Nikonian since 11th Sep 2008
Tue 13-Nov-12 11:06 PM

James,

Thank you for the clarification. Indeed do have the step size set to 1/3 stop.

Bob Z.

RWSTARRETT

Gardnerville, US
149 posts

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#4. "Auto ISO settings" | In response to Reply # 3

RWSTARRETT Gold Member Nikonian since 03rd Feb 2009
Wed 14-Nov-12 08:31 PM

Now that is a wonderful example of the value of the Nikonians web site! No prolonged discussion of opinions on "x", just factual info. I've been wondering the same thing.

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