[LargeFormat] 8x20 to 12x20

[Karl Faller]

Craig,

First:  Check with Reid Tool Supply Co. on line for any spur gear 
tracks, gears, missing knobs etc., they will have what you might need.
Second:  If you are using large lens you might want to enlarge the 
front lens board frame to carry a 7" lens board.
Third: The dimensions you requested, for a 12x20 Folmer are:
    Camera Back:  O.D. = 22 1/16 x 16"
    Ground Glass frame: O.D. = 22 5/16 x 14 1/2" I.D. = 19 3/4 x 11 3/4" 
plus 1/8 for the ground glass.
    Film holder:  O.D. = 22 7/16 x 14 15/16" I.D. = 19 1/2 x 12 1/16"
The only problem you will have that will be difficult to solve is 
finding the springs for the ground glass frame.
In order for the camera to close properly you will need to increase the 
size of the front standard as well as the rear.
In my opinion it would be wiser to purchase a 12x20 and have it 
restored.

Karl



> Hi All,
>
>
> I am currently restoring an 8x20 banquet camera. I have taken it apart 
> (photographing each step of the way so I know how to put it back 
> together!) and have stripped the finish from the wood. A friend of 
> mine, an excellent woodworker is doing some minor repairs to certain 
> areas. His work has been so good that I have asked him to actually 
> replicate each piece of the camera in mahogany. I have another friend 
> who is a metal smith. He has agreed to replicate the brass parts (I 
> will purchase bellows and gears etc. on line).
>
> When all is said and done I will have sufficient parts/pieces to make 
> two cameras, the refinished original as well as a brand new one. 
> However the thought occured to me that I can simply scale the back of 
> the replica camera up to 12x20 from 8x20.
>
> My question is this:
>
> How do I caluclate the amount of extra width I need on the back. The 
> image size of the 8x20 is not exactly 8x20 (something like 7 5/8 x20) 
> and the slot for the film holder obviously has its own measurements to 
> accept an 8x20 holder. It seems to me that I really need an extra 4 
> inches of width, n'est-ce pas? Or is it a bit more complicated than 
> that?
>
> Would anyone on the list be so kind as to measure their 12x20 back for 
> me so I may make one like it for my camera? I would need all the 
> appropriate measurements including inside and outside dimensions, film 
> holder size etc. I can then compare them to the 8x20 back to see where 
> I need to add the extra room.
>
> Thanks,
>
> Craig K.
>
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