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Best iso setting for your camera

So 75 posts in to come to the same conclusion of the answer in post #2.
 
Sure, when considering noise levels. But there are other tests i have to perform to be sure its generally good to shoot at 100. Shooting at the extremes of my lenses has thought me that its never clear cut.
 
In theory 100 is usually better. I only ever use 100 if I am using a tripod or trying to slow shutter speed for a reason or (and this is rare in Ireland) that I need to use 100 as another higher iso means an exceedence of camera shutter speed ability. 200 or 400 is usual for me outside. These settings do not give (to my eyes) any noticeable image quality penalty over iso 100 and allow for an inflated shutter speed which ends up as more keepers for me. Each to their own though.

(canon 550d only allowed full stop iso increments, in auto iso the camera could select in between these)
 
FWIW, I'm pretty sure that native ISO on Canons is typically 100, and on Nikons it's 200. One other random tidbit, on older Canons, at least, partial stop ISO settings were accomplished by essentially adjusting exposure up or down, much as you would in Lightroom, vs. full-stop ISO changes, the effect being that the partial-stop ISO settings are more or less simulated. I'm not sure if or when this was ever changed -- I think it's a product of the sensor technology.
 
Native (Base) ISO on my Nikons is ISO200. I start from there and increase as necessary for the scene at hand. If ISO3200 is best for the aperture and shutter speed I want, well then, it's ISO3200.

I have tried using the Auto ISO setting, but only as a learning lesson of how the camera decides what it thinks is best. Generally, I know what I want already, which is the lowest possible ISO setting.

BTW, eye-ess-oh.
 
considering it's an acronym...
 
you don't spell those out? ;)
 
ISO = International Standards Organization. And I spell it out. lol
 
And here i thought that iso meant iso.
 
But IOS doesn't have the same ring to it.

The corporation I work for are ISO compliant for medical devices and most likely for their other branches of business. The hoops we have to jump through are many to maintain this. Actually, this month I have to go through a series of mandatory recertifications. Whenever we discuss these matters, the vast majority refer to it as the EYE-ESS-OH compliance. But here's the rub, our medical equipment, at least the modalities I deal with, have an ISOCENTER. The isocenter is the base point where all the pieces of equipment are referenced within the exam room... floor to ceiling. All ceiling rails, table core, pull boxes, floor trenches, etc. are dimensioned from this isocenter. However, when we refer to the isocenter verbally, it is pronunced EYE-SEW. Go figure.
 

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