At 05:57 15.03.01 -0800, Gary Reese wrote:
>From the first URL above, it looks to me like the Vivitar 600mm Solid
Cat has pretty significant light loss.
That is to be expected. I believe "Solid Cat" means that the innards of the
lens is one big lump of glass, a mangin lens. The corrector is the front
surface, the primary mirror is a ground sphere aluminized on the back.
There will be quite a few inches of glass to pass through.
Anyway, the difference between f/8.0 and f/8.9 is only 0.30 stops. I'd be
more concerned about fall-off, because it can't be conpensated for, and
there the Vivitar is excellent.
Regards,
Thomas Bryhn
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|