That zoom is plus .25 to minus .25 inch focal length. If on a 2 inch lens
range would be 1.75 to 2.25.
On Thu, Apr 21, 2016 at 7:18 PM, Steve Polta <steve.po...@gmail.com> wrote:
> Dear Gearheads,
> San Francisco Cinematheque is in possession of a zoom lens
> attachment—specifically a Buhl 16mm "Varazoom," Cat. No. 833-490. You can
> see one just like it here
> and here
> I know it says "video" on those pages but we use it for 16mm (I also
> realize that those two pages might be somehow clones of each other.)
> The device is screwed on to a 50mm fixed lens and is obviously intended to
> add zoomable variance to this fixed lens. And indeed it does—you can see it
> The question: can anyone tell me what the effective focal length(s) of
> this combo provides. I'd like to be able to communicate this info to
> someone but cannot find this information anywhere.
> Thanks for any useful feedback that can be provided.
> Steve Polta
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