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View Full Version : Cambo 6x9 back---Nominal size.



Petewit
4-May-2008, 07:35
I have just acquired a Cambo 6x9 rollfilm back to fit to my 5x4. Whilst making a mask I find that the gate is 57 by 82 mm. Is this the nominal size for 6x9 or is it just peculiar to the Cambo.
Are any other backs a true 6x9?
While we are at it has anybody measured a 6x12 frame?

Pete

Allen Rumme
4-May-2008, 09:46
The image area of negatives exposed in a 6x12 Horseman back measure 56mm x 112mm.

vonstauren
4-May-2008, 10:11
Indeed, other 6x9 (Fuji range finders) have also the 57x82mm film gate. But there can be variation in other 6x9 RFH. If I remember well the Cambo 612 is also 56x112, have no access to it right now. A true nominal 6x9 is probably only on the cameras you can make yourself. You would only get 7 pictures on the 120 film then.

Dan Fromm
4-May-2008, 11:45
6x9 is a poor metric approximation to 2.25" x 3.25"; 57.2 x 82.6 is accurate but harder to remember and say. 6x9 has a ring to it.

The length of nominal 2.25x3.25/6x9 roll holders' gates varies considerably. The shortest I know of is the nominal 2x3 Graflex with pin rollers, whose gate is around 78 mm long. I believe that some (which? My memory's failing again.) are 84 mm long.

Petewit
4-May-2008, 12:15
Thanks for the info. I'll try to resist filing out the gate on the Cambo.

Pete

Dan Fromm
4-May-2008, 13:50
Thanks for the info. I'll try to resist filing out the gate on the Cambo.

PeteFiling out the back would be a bad idea. The film wind mechanism knows how wide the gate is, advances the film accordingly. File out too much and frames will overlap.

vonstauren
4-May-2008, 14:37
Thanks for the info. I'll try to resist filing out the gate on the Cambo.

Pete

If that can console you, the excellent Mamiya Universal 6x9 RFH are 56x83 mm.:) Grab them while you can...

vonstauren
4-May-2008, 14:46
Filing out the back would be a bad idea. The film wind mechanism knows how wide the gate is, advances the film accordingly. File out too much and frames will overlap.

Oh, not so quickly! It is a good idea if you want to have the real 6x9 gate! I just measured on a Fuji 690 range finder: you have 10mm gap between the 56x82mm exposed film areas. Now, if you file the film gate just 4mm on each side, you get a real 56x90mm film gate and still you will have 2 mm black frame in between the pictures. Not bad that. And, at least in the case of this Fuji camera, the spacing is regular, no matter how you look at the camera while winding the film...:) I suppose that filling a Cambo would be easier than filling inside the Fuji though...

Petewit
5-May-2008, 04:05
Thanks for the advice. Enlarging the frame seems a bad idea as it will increase the risk of light leak between adjacent exposures.

Pete

vonstauren
5-May-2008, 04:22
Thanks for the advice. Enlarging the frame seems a bad idea as it will increase the risk of light leak between adjacent exposures.

Pete

Not at all! As far as you have a black frame between the pictures there won't be any light bleeding. If you file it in the same angle as the original film gate you have nothing to fear. The black frame is a sharp border - regardless of the number of mm of its thickness between the pictures

Bob Salomon
5-May-2008, 04:51
The image area of negatives exposed in a 6x12 Horseman back measure 56mm x 112mm.

Linhof 612 cameras and backs are 56 x 120mm