[Frameworks] question about a lens...

[Dominic Angerame]

What projector lens does this item screw into.


On Fri, Apr 22, 2016 at 5:26 AM, Scott Dorsey <kludge at panix.com> wrote:

> > The question: can anyone tell me what the effective focal length(s) of
> this
> > combo provides.
>
> I can't, because I don't know the ratio of that varifocal gadget.
>
> But you can figure it out yourself... put the projector ten feet from a
> screen, focus the image with the lens racked forward and with it racked
> back, measuring the screen width each time.  Then you can use a screen
> size chart to work from that back to the effective focal length.
> --scott
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