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Making my own Roll film back

 
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scattergood



Joined: 19 Nov 2011
Posts: 9
Location: Caerphilly UK

PostPosted: Sat Nov 19, 2011 8:40 pm    Post subject: Making my own Roll film back Reply with quote

HI all!

I'm VERY new to large format. What I'm looking to do is I'm sure quite easy.
I'm looking to use 120mm film with my crown graphic (Graflok back) However I don't want to spend a lot. In fact I'd quite like to be able to use a roll back I already have.

Could I fashion a board of some sorts to fit a back onto? Or am I way off the mark?

Cheers, and sorry for possibly not getting it!

Scattergood
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45PSS



Joined: 28 Sep 2001
Posts: 3246
Location: Mid Peninsula, Ca.

PostPosted: Sat Nov 19, 2011 9:57 pm    Post subject: Reply with quote

An adapter board to fit a RFH of one camera format size to another is not that hard to do. Going from a 2x3 format to 3x4 or 4x5 will be easier than going 4x5 down.

What do you currently have?
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scattergood



Joined: 19 Nov 2011
Posts: 9
Location: Caerphilly UK

PostPosted: Sat Nov 19, 2011 10:23 pm    Post subject: Reply with quote

My girlfriend has an RB67 which I can use the back off. But I'm happy to buy anything that would probably be easier

Cheers!
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45PSS



Joined: 28 Sep 2001
Posts: 3246
Location: Mid Peninsula, Ca.

PostPosted: Sat Nov 19, 2011 10:42 pm    Post subject: Reply with quote

The Crown came in 3 formats, which do you have? The RB RFH will fit the 2x3 Crown without any camera modifications. The RB Pro S RFH will need the lockouts disabled (taped to the not locked position) to work fully.
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scattergood



Joined: 19 Nov 2011
Posts: 9
Location: Caerphilly UK

PostPosted: Sat Nov 19, 2011 10:45 pm    Post subject: Reply with quote

I have the 4x5 size. I know the tabs you're talking about and that seems like a pretty simple thing to do.
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scattergood



Joined: 19 Nov 2011
Posts: 9
Location: Caerphilly UK

PostPosted: Sat Nov 19, 2011 10:54 pm    Post subject: Reply with quote

Also, what is the cheapest option for doing this? Could I buy like an old kiev 88 back and make that fit?
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45PSS



Joined: 28 Sep 2001
Posts: 3246
Location: Mid Peninsula, Ca.

PostPosted: Sat Nov 19, 2011 11:33 pm    Post subject: Reply with quote

Graphic made RFH for their cameras.
The Graphic 22 and Graphic 23 pictured in this a
http://www.cameraeccentric.com/html/info/graflex_1.html
and the RH series
http://www.cameraeccentric.com/html/info/graflex_13.html
all of which were made for 4x5 format graflok backs and currently sell for $125 to $150 on ebay.

The RFH camera side dimensions are:
4.765 inches wide; 121.04mm.
6.788 inches long; 172.42mm
The film pressure plate is .197 inches from the face of the RFH; 5.0038mm. (Industry standard).
The outer most light trap rib is .448 inches from the darkslide end; 11.39mm. The inner most light trap rib is 1.228 inches from the darkslide end; 31.19mm. The outer light trap rib is .065 inch wide; 1.66mm, the inner .095 inch; 2.41mm. These should be the same as a standard two side sheet film holder.

Cut a piece of thin plywood or hardboard to fit the back opening then cut out the center so that the RFH fits and the film plane/pressure plate is at the correct depth from the face of the adapter.
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scattergood



Joined: 19 Nov 2011
Posts: 9
Location: Caerphilly UK

PostPosted: Sun Nov 20, 2011 12:36 am    Post subject: Reply with quote

Thanks so much! I really appreciate it. I'll let you know how it goes!
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