BW wrote:
>Here is another product I.D.? "Vivitar 400mm f:5.6 Autotelephoto 77mm"
>9 1/2 inches, no evidence of MC. Heavy w/ satin black finish. Oly mount.
>A rectangle button nearly 1 inch long with "0 arrow - arrow L" on it,
>I think to change the f stop rotation?
The last part sounds like the Vivitar TX mount -- a one time competitor
to Tamron's Adaptall concept. However, the description of the lens itself
doesn't match my best source on Vivitars -- John Wolf's 1980 book, where
the 400mm TX lens looks like a Tokina RMC 400/f5.6 clone and is MC.
In the same source, Vivitar's fixed mount 400mm lens is actually closer
to BW's above description, but is longer (11.5 in), has a built-in tripod
collar, and is also MC.
In either case, BW's lens sounds like an older model. Hope this helps.
Cheers,
/Gary Schloss.
Studio City, CA
schloss@xxxxxxxxxxxxxx
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