Re: EOS ISO Changes

[HMSDOC]

<< I think what  your asking is: Even if the camera can't
 display the difference in exposure, does it correctly
 adjust the actual shutter speed & aperture, or does it
 use what is displayed?>>>

That's exactly what I am asking, only phrased mcuh more clearly and 
succinctly...


<<< The answer is, it depends.
 
 If you're in manual mode, the camera will use the
 aperture and shutter speed you set.  Period.
 
 In AV mode, the camera will use the aperture you set,
 but adjust the shutter to the actual "correct"
 exposure, even if that's a smaller increment than can
 be displayed.  Same for TV mode.
 
 In P mode, both the aperture and shutter will vary in
 smaller increments than can be displayed.  There have
 been a couple of attempts to measure the resolution of
 the lens/shutter/metering system over the years.  I've
 read answers of from 1/6 stop accuracy to as fine as
 1/10.  Don't know what the correct answer is.>>>

Well, I shot that whole roll to try to determine theISO rating for Velvia 
that I liked best with my Elan 7.  The problem is I did it in manual mode 
keeping the aperture the same for each ISO setting  and varying the shutter 
speed to get what the viewfinder showed was the correct exposure (with camera 
on tripod, obviously).  So that explains why for many of the shots the 
exposures were the same for close ISO readings.  I should have done it in 
aperture priority mode.

Oh well, for most shots I liked either ISO 40 or 50 the best.  So I will just 
rate it at 50 and do some 1/2 stop bracketing and maybe even some ISO changes 
for my "real" shooting and see what I like best.

So in these other modes, since the camera can't display these changes of less 
than 1/2 stop I guess you never really know EXACTLY what you have shot at.  
Not a problem in general, but if like me, you are truly obsessive, it would 
be nice for fine tuning.   That said, where the camera did vary the exposure 
for a small difference in ISO I can't say that I saw a whole lot of 
difference between the shots.  But I presume that is because of my 
inexperience. Another reason I wish the camera could tell you exactly what it 
did as I would like to train my eye to be able to pick up these differences.

Enough rambling.

Howard
[EMAIL PROTECTED]

 
 

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