From: "John A. Lind" <jlind@xxxxxxxxxxx> -- writ in part:
At 18:31 5/7/01, Joel Wilcox wrote:
Hi John,
Do you happen to know if your working distance using 135/2.8 with
extension is similar to using a 135/4.5?
---------- Short Answer ----------
Working distance would have to be approximately the same for the same
magnification because the focal length is the same
---------- Long Answer ----------
<snipped lots of amazing stuff>
Wow. Thanks.
I've got the Viv tubes. I'm not thinking about using the 135/2.8 on the
notion that it would be faster but because the lens seems to me to be very
good. Also, all being otherwise equal between the two, if the 135/4.5
allowed me to stay further away from the subject, I would find this to be a
selling point. I don't do well stalking butterflies even with the 90/2.
I've had some good experience using the 300/4.5 with a little extension for
close focus at a good working distance, but not handheld.
Joel W.
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