I have used a Hoya SuperHMC (about 2mm thick) and it does not seem to
vignette wide open.
Chris
Working with the B+W Slim-Pol. the 21 f 3.5 foc at Inf. vignet. until f 8.
The first apperture without vigneting is f 11.
Ángel Lobo.
CUENCA ( SPAIN )
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C M I Barker
Gamlingay, Cambridgeshire, Great Britain
mailto:imagopus@xxxxxxxxxxxxxxxx
mailto:chris_barker@xxxxxxxxx
YaC tel: +44 (0)7092 251126
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