On 8/1/2025 3:17 PM, Stanley Halpin wrote:
Bill, thanks for the extensive description of your setup! And thanks to Ralf
for his question!
When I read your first post and did a quick look at the image of your setup, my
first question was “what light source?” I hadn’t expected something quite so
elaborate, but totally understand the concept.
I have tried doing some 35mm film and slide scanning via
camera-on-a-copy-stand, macro lens, using a light-box for light source. Never
satisfactory, the lighting just too uneven across the frame.
Stan
Hi Stan, one of the things I learned working in photolabs is you can
never have too much diffusion....
The 6" light source on it's own would probably have given me coverage
for the 4x5 negs as long as it was 6" or so away from the film, but
because of the nature of pucks, there would have been a hundred or so
little dots of light, or how many individual LEDs are in the puck
visible through it's diffuser, and as the LEDs fail over time, the
lighting would have become increasingly uneven.
Hence the huge diffusion filter. Also, I wanted to keep exposure times
on the longer side in case there is flicker, though fortunately there
isn't since even with all the interruption the exposures have been
around 1/125 @ f8 @ ISO125.
Fun stuff.
bill
--
%(real_name)s Pentax-Discuss Mail List
To unsubscribe send an email to [email protected]
to UNSUBSCRIBE from the PDML, please visit the link directly above and follow
the directions.
