On 4/25/2017 21:43, Mark Roberts wrote:
John Sessoms wrote:
The lens is a Sigma AF 300mm f/2.8. I have a matching Sigma 1.4x
tele-converter for it.
https://www.pentaxforums.com/userreviews/sigma-300mm-f2-8-apo-ex-dg.html
The Astrozap filters come in various diameters. They're actually for
small telescopes.
Do they make them in small sizes for big telephotos that take drop-in
filters?
I didn't find one. My 300mm f/2.8 takes a 46mm filter. The smallest I
found was 58mm.
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