Regards,
Marv
Uptown Gallery wrote:
Hello & Happy Holidays:
I gutted 4 Polaroid folding bellows cameras (mostly roll-type, maybe all
four were) to see what I could make use of for conversions to 4x5. (J66,
150, 95B, 100). LOTS of rivets to drill out!
The J66 and 100 will end up as pinhole cameras. I intend to add an extender
box on the back to allow a 4x5 film holder that (hopefully) will be fully
covered. I think if I move it far enough back (haven't done the geometry
yet, hopefully it's a practical distance!) & select an appropriate pinhole,
I think they'll work.
The 95B and 150 (latter has knob-driven focus, kind of nice) have identical
130 mm (3 element?) lenses and EV exposure system. Polaroid gave me shutter
speeds and apertures corresponding to the EV numbers).
Now here's where I need help - I'm mechanically and spacially challenged...
First experiment will be to see if 130 mm lens has enough circle of coverage
to do 4x5 holder, or how much of it will be covered. By adding an extender
box on the back while retaining the 130 mm lens, I think I will have to
retract the bellows slightly to make up for the distance - if it works out
to 150 mm distance at the current infinity focus position, the 130 mm lens
will be out of focus there, right ? (at new film position of 150mm)
If this is disappointing, I'll have to figure out a way to put a 150 mm lens
in. (or a "coke bottle" 6 diopter eyeglass lens + small iris).
Has anyone else done anything like this? Most people talk about 110A/B
conversion to pack film with that big Rodenstock Ysarex lens.
Thanks
Murray
_______________________________________________
Cameramakers mailing list
[EMAIL PROTECTED]
http://rmp.opusis.com/mailman/listinfo/cameramakers
_______________________________________________ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
