agillot

all cameras have a sweet iso , 100 is probably it , going under will not improve quality , as well as going over .

cambriaman Loc: Central CA Coast

Thanks to amfoto1 for the best reply to the topic I have read!

fetzler Loc: North West PA

RFM!

pithydoug Loc: Catskill Mountains, NY

Absolutely. There are few that give clear concise answers.

pithydoug Loc: Catskill Mountains, NY

Then why are you even here? Rhetorical. Almost all answers can be found someplace or in some manual. In case you haven't noticed many camera manuals are not worth the paper they are written on. Most are highly technical reference guides and not tutorials. They assume you already know stuff and use abstract terminology. That is why there is an entire publishing industry that does camera manuals in detail.

Salo Loc: Cherry Hill, NJ

In the old film days, the studio and magazine photographic "standard" was Kodachrome-25. It rendered the most accurate color, contrast and grain-free images available. I believe ISOs below 100 in modern DSLRs utilize a software algorithm for their implementation, but it wouldn't hurt to try examining comparative shots taken at 80, 64, or 50 (and 25 if available) to see if there is any visible image enhancement or deterioration with your specific camera. Of course, the lower the ISO setting, the longer your comparative shutter speed will be (at equivalent aperture), but you might find that to be quite useful in certain circumstances. I always stay at or around ISO 100 whenever possible, and go above ISO 400 (or 800 max) only when absolutely necessary.

GLKTN Loc: TN

Thakns to everyone. I appreciate all the information.

RWR Loc: La Mesa, CA

The only difference I can see at the lower ISOs (80, 64, 50) with my Df is a little increase in contrast. It’s noted in the manual also.