Quote Originally Posted by Chuck Lee
Not at the same shutter speed and aperture as ISO 160.

Hmm, so - without getting in between you and Daniel's discussion (as it's obvious you both can talk at a higher level about this than me), I think you guys did agree that some 'tweens are better than others. 1250 over 1000, 500 over 320...(okay, that 2nd one I just made up). But there is consensus on using 1250 instead of 1000 right? And somebody mentioned that 160 on the 40D was "as good as it gets [with 'tween ISOs]."


Which 'tweener ISOs are less bad and which ones should be avoided? I realize it depends upon the camera. Personally I am particularly curious about the 40D as it's my main body for now.


One more question - is any of this relevant to amateur photography? We all want to maximize our body/lens' potential, get the best images we can, but are the differences so minute that it takes 100% views on 24" displays to notice them? Or will a photo shot at one of the especially bad 'tweeners, printed 8x10, look obviously worse than the same photo shot at a native ISO?


Thanks guys!