Dear Charles,
I have had a lot of fun over the years with a 500 mm Cat Lens which has a
T-mount.
This lens has a fixed f stop of f8 so the only ways I can vary the exposure are
by changing
the speed or adding filters to the front or the back or by using a doubler.
Most of the time I just use the old reciprocity rule and set the shutter speed
to 1/500. At other
times I use a flash and make a "guesstimate" based on the guide number of the
flash and whether
I'm using a fresnel lens to project the flash.
http://flzhgn.home.mindspring.com/hek2.html
I put such a 1000 mm picture on the hummingbird section of my web site.
When I'm using an OM2S I just let the camera determine the exposure and it
always comes out
bang on polarizer or not.
I've seen the "Cat" lenses for sale on the used market for around a hundred
dollars and the new
catalog price of a Ritz Quantaray (the one I use) for $125 ! Where else can
you get such awesome
focal length so cheaply ? It's a great addition to any photographer's arsenal
of lenses !
Many of my favorite pictures were taken with a "Cat" (catadioptric aka mirror,
reflex) lens.
-- Hank Hogan <hogant@xxxxxxxxxxxxxx>
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