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Re: [OM] "4th of July" B'fly count at Appleton Farm

Subject: Re: [OM] "4th of July" B'fly count at Appleton Farm
From: Mike Gordon via olympus <olympus@xxxxxxxxxxxxxxxxx>
Date: Tue, 29 Jun 2021 23:56:41 +0000 (UTC)
Cc: usher99@xxxxxxx
<<There are theoretical reasons (I think. Mike?) to be concerned about IS with 
C-U lenses. I've not had trouble I know of with that.

Yes the  CU diopter messes with the FL and the mag so IS doesn't know which 
side is up.  The image displacement by movement is a direct function of FL 
modified by 
the factor (1+M)**2 where M is the magnification.   I have seen some motion 
blur when I thought the SS was sufficient.  Best to use a higher SS--too bad 
there is no way to tell the cam a diopter is in front and the IS could be 
altered to account for it.  Not holding my breath for that firmware update. 

Be concerned, be very concerned, Mike  (in theory) 
-- 
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