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AreBee

Inverness, UK
531 posts

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AreBee Registered since 27th Apr 2008
Sun 30-Sep-12 11:51 AM | edited Sun 30-Sep-12 11:51 AM by AreBee

Dear All,

Quite by accident I recently discovered something that has me confused: An image taken at ISO Lo 1 (ISO 50 equivalent) is sharper than the same image taken at ISO 100, all else being equal.

I have checked separately with three lenses and the above statement holds true. The results are repeatable. I haven't checked ISO settings greater than 100 as I never use them.

To cut a long story short, the results cannot be explained by poor technique or adverse environmental effect.

ISO Lo 1 (100% crop):

Click on image to view larger version


ISO 100 (100% crop):
Click on image to view larger version


Why would ISO affect image sharpness, all else being equal? Am I simply seeing greater noise in the ISO 100 image, which has reduced contrast and hence the perception of sharpness, or is it something else?
Attachment#1 (jpg file)
Attachment#2 (jpg file)

Rob
www.robbuckle.co.uk

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