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

[Mike Gordon via olympus]

<<Curious what the 
<<working distance was with the 100-400 + diopter?

As you know the  max working distance is solely a function of the diopter.  The 
Fl of the diopter is in its name--works out to 0.76 diopter.  So max working 
distance
is 1/0.76 m or about 4 1/3  ft.   Good enough for many nervous little critters. 
 The FL of the lens attached determines the mag.  

No spook, Mike
-- 
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