[MF3D.FORUM:1163] Re: Camera design

[Sam <3dhacker@xxxxxxxxxxxxx>]

At 01:48 PM 8/25/00 -0600, you wrote:

> >If you are going to use a FP shutter anyway, why not go all the way and
> >make it a DLR (Double lens reflex)? That way there is no need for a lens in
> >the middle, could have a 2 1/4" stereo base, and you would have at least a
> >possibility of also viewing directly in 3d. If I ever find someone with a
> >Mentor Stereo Reflex camera (ANYONE?!?!) I could complete my version of
> >this which has been on hold for months due to a shutter curtain problem
> >needing to be solved.
>
>   That's a neat idea but it does
>complicate things. The FP shutters
>I have in mind are right behind the
>lens not actually at the film plane.
>So the reflex mirror would be required
>to keep 100.000% of the light from
>reaching the film. You would also have
>to rig up some mechanism to close the
>behind-the-lens shutters, pop up the
>mirror and then re-open the shutters
>for exposure.
>

No more than the rest of it really. Some Exactas, Mentors and most early 
SLRs use the mirror box as a light baffle. Triggering the shutter by the 
action of the mirror coming up is pretty simple. The only big disadvantage 
I see is having to stop the lenses down before exposure, unless you can 
incorporate a stop-down mechanism as well. The bottom line is that if 
you're merely bastardizing existing cameras anyway and NOT building a 
camera from raw metal and glass stock, the sky's the limit as to what is 
available to salvage. Time, money and patience are the other variables!

Sam