A few words on Equivalence and comparing systems

Started Apr 2, 2013 | Discussions thread
Great Bustard
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Re: The role of ISO
In reply to Dr_Jon, Apr 3, 2013

Dr_Jon wrote:

Please note I wasn't happy with my second post and rephrased the first part somewhat to more clearly explain my initial post.

I wasn't thrilled with "That said, many take some very nice photos in Auto mode", but perhaps I read too much into it.

I believe you did "read too much into it".  What I meant is that all these technical points are often unimportant in terms of the overall impact of the final photo.  In other words, IQ usually plays a distant second to the recorded scene.

For example, let's say I took a photo at f/2.8 1/100 ISO 400 and everyone thought it was great.  If I took the same photo at f/5.6 1/50 ISO 800, how many would notice, much less care?  That is, there's usually a rather large range of parameters that doesn't affect the appeal of the final photo.

Although it is true I've seem some very nice shots taken that way. Also I've been a slight convert to sometimes using Auto-ISO on my RX100 in A or M modes recently, after more years than I can remember of always choosing the ISO explicitly, partly as getting quick shots of "something happening right now" in bright sunlight where the screen is hard to see can go badly wrong otherwise. (Actually the GH3 getting Auto-ISO in M would be very useful for movies, well if the ISO steps were small.)

M mode + Auto ISO is awesome, and something I very much looked forward to when I upgraded from the 5Dc to the 6D.  However, Canon's failure to allow EC with that particular combination limits its utility, unfortunately.

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