4 Jul
2012
4 Jul
'12
12:51 p.m.
ard at p850ug1.demon.co.uk (Tony Duell) wrote:
AFAIK mine only does NTSC-rate video (OK, for the pedants, RS170 rate
video), there is certainly no itnernal framestore. (...) there's a disk
with 4 filters (one clear, maybe just a hole) and a stepper motor to
move them. There is some kind of control board, I seem to remember it's
microprocessor based,. maybe even an 8080. And not much more. I don;t
rememebr there being an internal NTSC or PAL colour decoder.
So it must takes RGB component input (no decoder) and you have to feed it a "freeze
frame" video signal, i.e. keep the image content static (no framestore) until the
three exposures have been completed?
(...) it displys TV-rate video on an
internal CRT and photographs it.
There's a colour fitler wheel (red, green, blue and a hole) so it cna
print a colour inamge in 3 goes.
(...) (...) As I mentioned, the optics is a standard, and
not very
good (Soligor, I think) enlarger lese. It's essentially fixed focus
(well evetyhing is at a fixed distance, so that's OK), it's fitted to a
meatl tuve which slites into the camera body and is lcoked by a
setscrew. Presumably you can focus it if necessary when you repari the
unit.
I also got what looks ot be a home-made bracket with it. 'Home made'
meaning not a Polaroid product, I suecpt it was made in the workshops of
the university I got this thing from. This fits in place of the Polaroid
camera. It looks like it would have held a35mm SLR + motordrive (...)
OK, so making a camera adapter in a "normal" workshop is confirmed to be
possible. Apart from interfacing the signals, it looks as if the most complicated part of
it was somehow joining the camera body, the lens and the distance tube in a mechanically
solid and light-tight fashion without messing up the distances between the components as
you go.
Err, yes... I think if I was going to make this, I
would start wit ha
dead electronic SLR, though. On the grounds it has interchagealbe lenses,
a motor to wind the film and solenoids to open/close the shutter. Then
remove the dead electroncis and make my own cotnrolelr. Whether I'd leave
the mirror in palce I don;t know, it might be easier to do so if the
sugger mwchanism depends on it for the corraect sequece.
Seems like a very sane approach. I'll have to see what I can come up with, as I know
for sure I don't have a broken SLR in my junk box...
Well, an enlarger lens is typically used to enlarge
:-). What I mean is
that the distance from the front to whatever (paper in an enalrger) is
longer than the distance from the back to whatver (negative in an
enlrager). So if you put the CRT where the paper would be and the film
(in the cmaera body) where the negative should be, it'll work and
produce a reduced image of the CRT on the film.
That sounds like waht yuu want.
Ahh, I see. I had something backwards but now I can't see what it was...
Thank you so far,
Arno.