Best way to duplicate 6x7 slides?

[Bill Glickman]

I am trying to determine the fastest and most econocmical method to duplicate 6x 7 color chromes? Is there a MF lens and back set-up which is specifically desig ned for this? I have considered a film recorder, however they are very expensiv e, $30k, and quite slow vs. firing a shutter. (10 minutes per expsoure) I also have considered making a digital file then going to a film recorder and print an 8x10 piece of film...then contact dupe them to 8x10, then cut them up. I need to have a set up that will allow fast duping of 100 of each chrome. Thank you.

[Ted Brownlee`]

Bill:

The short answer is "no." I researched this a year ago or so. The best description I found was in one of Jim Zuckerman's books ~ the one on color photography. (The cover has an orange-sky silhouette.) Basically, you need a roll film back, means of illumination & filtration & a way of controlling exposure. Then you need to test & characterize the setup. There is no device like the Besseler slide duplicator for medium format. The best bet, aside from in-camera duplicates, is a 70mm repro-grade duplicate from a good lab.

~Ted

[Bill Glickman]

Ted, can you describe what this is? 70mm repro-grade duplicate Is there a machine that does this on 70mm? That would be fine also?

Thanks

[Jan erala]

Duplicate film is made in 100ft rolls and 70 mm wide. Before I bought a 70 mm duplicator I duplicated slides with an enlarger and a little easel that I made with a 6x9 (or 6x7, how you want) frame. The easel was protected by both sides with some pieces of cardboards so the flare light from the enlarger shouldn't fog the film. I forwarded the film by hand the needed amount. It all worked fine and was in fact very easy to do when there was made many dupes from the same slide. The task is to calibrate the dupefilm, you have to search and bracket for the right speed and color.

[kthompson]

I would suggest paying a good lab to do this for you, on 70mm dupe film. Making good, clean & accurate dupes is tough....BTW, any duper capable of handling 4x5 CTs as originals, can be used to dupe 120. The problem is in getting the duping film in a size under a long roll. The majority of these lab machines are made for long roll duping like a Marron Carrol, or a Forox duper...not cheap gear. We use a 4x5 Chromapro duper for our 4x5s, and dupe down to 35mm on Fuji CDUII film using an F3 fitted with either a 55 Micro-Nikkor or a 105 Micro Nikkor. We place the duper on our bencher copystand to act as a stage....this works good enough for our purposes, we can make better dupes this way than we can get locally. We run our own E6 in-house, so that nails down that variable as well.

There are other methods, like some Wess dupers that use contact, or making projected dupes like you would an interneg, using a color head. But for making 100, clean & consistent dupes of one original, just pay someone who's set up to do this. Duping 1:1 is tough enough with even a good system. As far as I know, 70 mm is long roll only. Even if you could do it in-house, E6 processing will be rough as well.