A Chance To "Play" With 2 1/4 x 3 1/4 and 3 1/4 x 4 1/4

[Pete_6109]

Hi Pete! When you say you "converted an old Graphic film back adapter to use as a ground glass," what exactly did you do? Did it require some mechanical or machining procedure?

Hi lomomagix,
All I had to do is remove the darkslide and then I cut a ground glass that would fit inside the film pack adapter where the sheet of film would normally have gone. I used some black duct tape to hold the ground glass in place. When I measured the distance from the ground glass to the outside of the film pack it matched the distance on my roll film holder from the film plane to the outside of the holder, so it appears that my focus should be ok. As soon as I get my film back from the developer I'll know if it worked or not.

[Dan Fromm]

If you want to get it exactly right, put the piece of GG in an empty film pack or shim it back from the film pack adapter by the thickness of the front edge of the film pack. In an FPA, the film isn't up against the back of the FPA's front, it is in the pack.

[Pete_6109]

If you want to get it exactly right, put the piece of GG in an empty film pack or shim it back from the film pack adapter by the thickness of the front edge of the film pack. In an FPA, the film isn't up against the back of the FPA's front, it is in the pack.

Dan,
You are exactly right, I forgot about the thickness of the film pack itself. I'll look for one so I can measure the thickness of the front edge of it.

[lomomagix]

Hi lomomagix,
All I had to do is remove the darkslide and then I cut a ground glass that would fit inside the film pack adapter where the sheet of film would normally have gone. I used some black duct tape to hold the ground glass in place. When I measured the distance from the ground glass to the outside of the film pack it matched the distance on my roll film holder from the film plane to the outside of the holder, so it appears that my focus should be ok. As soon as I get my film back from the developer I'll know if it worked or not.

Great! Please keep us posted, this is very interesting to me. And please tell me where pieces of ground glass are available for purchase (and any specs, such as proper thickness?). Thanks!

[Dan Fromm]

lm, look for ground glass on eBay. You'll have to measure a film pack adapter to find out how much room is available for the GG.

Thickness doesn't matter, the ground side faces the lens, not the film (and photographer trying to focus on it).

[Toyon]

A CombiPlan can be adjusted to handle those sheet film sizes. Easy as pie.
http://www.bhphotovideo.com/c/produc...Combi_4_x.html


By the way, I have some 3.25x4.25 Kodak film for sale.