Re: 3Discover

[P3D sid herbage <sid@xxxxxxxxxx>]

P3D Sam Smith wrote:
> Why do you assume you would need several
> cassettes to view your own strips in a 3Discover viewer? These are not
> overly complex mechanisms. One $9 investment should give you what it takes
> to view your own strips. As long as the back is removable, you just simply
> insert another strip when required.

Well, I hadn't taken the back of a cassette and assumed that,
since the film seems to come to a hard stop at either end, it
was firmly attached to a spool (or somesuch) at each end. This
in turn made me think it would be a bit fiddly to keep swapping
films in the same cassette. Perhaps it's not as complicated as
I thought.

> it's a lot simpler problem than building the
> dupe camera in the first place.

I have some musings about that (and these really *are* musings,
I haven't really thought them through but they might spark off
some ideas from the good folks here).

(1) 4-perf gap

If I took a cheap, used SLR body, defeated the shutter interlock
and restricted the winder stroke so that it wound on 4 perfs
per stroke, I could wind either 4 perfs or 8 perfs (double
stroke) at will.

Of course 4 perfs wouldn't be enough to tension the shutter
(or perhaps it is necessary to disconnect the shutter tensioning
from the winder altogether). Could a shaft be brought out
to allow manual tensioning of the shutter?

Or .... might be easier .... trash the shutter altogether and fix
it open. Use a Thornton-Pickard type roller blind shutter ahead
of the slide carrier in the duplicator (a la Pat whitehouse).
Yeah, I know, light leakage around the slide carrier with the
camera shutter fixed open .... needs some though ..... must be
a solution. Perhaps the T/P shutter needs to be between the slide
and the camera. More difficult to arrange though. Not impossibe
if you want to cut the slide duplicator in half (should there
be a smiley there? I don't *think I'm joking).

(2) One side of the 3Discover film is transparent

So drill/machine a little cavity in the edge of the film gate
(where the perforations run) and insert a "grain of wheat bulb"
to fog the film edge during winding.



-- 
    ... Sid (sid@xxxxxxxxxx)


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