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

**lomomagix** · 29-Oct-2008, 08:15

Originally Posted by Dan Fromm

A 2x3 back will accept a roll holder made to fit a 2x3 back and 2x3 sheet film holders.

A 3x4 back will accept a roll holder made to fit a 3x4 back and 3x4 sheet film holders.

3x4 is larger than 2x3, what fits one won't fit the other. Attachments are size-specific.

Great! Thanks a lot Dan!

**Jiri Vasina** · 29-Oct-2008, 10:25

And just for the sake of trivia, I'm not aware of a 6×8cm roll film holder...

**Dan Fromm** · 29-Oct-2008, 12:30

Originally Posted by Jiri Vasina

And just for the sake of trivia, I'm not aware of a 6×8cm roll film holder...

I wonder what the actual size of the Fuji GX680's nominal 6x8 frame might be. Haven't checked, doubt it would fit a 2x3 Graflok.

Cheers,

Dan

**Nick_3536** · 29-Oct-2008, 12:43

Mamiya made a 6x8 RB back. Would that fit? My brain wants to say RB are 2x3 Grafloks. No?

**Jiri Vasina** · 29-Oct-2008, 14:40

Originally Posted by Dan Fromm

I wonder what the actual size of the Fuji GX680's nominal 6x8 frame might be. Haven't checked, doubt it would fit a 2x3 Graflok.

Cheers,

Dan

Yes Dan, I know of the Fuji GX680, but it's not supposed to work with other LF cameras. The only limits on adaptation are your skills, so it might be done. But I have not yet seen a roll film back made for 6x8cm size and intended for use on Graflok back cameras. And I have looked, because this format has the best proportions to me...

The same is true for the Mamyia 6x8 magazine. I think it would be easier to adapt this one - if my memory serves well, I have seen adapters to fit Mamyia film magazine to LF cameras... (most probably with international 4x5" backs) ??

**Dan Fromm** · 29-Oct-2008, 15:06

Jiri, I'm sure you know that depending on the make, nominal 6x9 backs are 56-57 x 78-84. These sizes, even the extremes, round to 60x80. When you say 6x8, what actual, not nominal, dimensions do you mean?

Cheers,

Dan

**Nick_3536** · 29-Oct-2008, 23:02

IIRC The Shen Hao Mamiya back converts it to a 2x3.

What I remember of the history is Mamiya bought Singer in the early 1970s. That got them the Graflex patents.

**Vlad Soare** · 30-Oct-2008, 00:55

Mamiya RB backs are Graflok backs. They will work with any LF camera accepting Graflok backs. They work perfectly with my Ebony 23S, for instance.
The image size of a Mamiya RB 6x7 back is 56x69mm.
The image size of a Mamiya RB 6x8 back is 56x74mm. Closer to 6x7 than to 6x8, if you ask me.

**Pete_6109** · 1-Nov-2008, 09:40

I have a 2x3 mini speedgraphic that was manufactured pre-Graflok. Mine has a "Graflex" back. The E. Suydam Company made 120 roll film holders for this type of back and I found one on that popular auction site. In order to focus the image I converted an old Graphic film pack adapter to use as a ground glass back. I measured everything and the ground glass appears to be in the correct film plane. After I focus the image I remove the film pack adapter and attach the roll film holder. It works out very nicely. The film pack cover works like a built in ground glass protector.
I shot some Velvia last weekend to test it. I'll know shortly if everything is in focus or not. Here's some pics of my setup.

**lomomagix** · 1-Nov-2008, 20:32

Originally Posted by Pete_6109

I have a 2x3 mini speedgraphic that was manufactured pre-Graflok. Mine has a "Graflex" back. The E. Suydam Company made 120 roll film holders for this type of back and I found one on that popular auction site. In order to focus the image I converted an old Graphic film pack adapter to use as a ground glass back. I measured everything and the ground glass appears to be in the correct film plane. After I focus the image I remove the film pack adapter and attach the roll film holder. It works out very nicely. The film pack cover works like a built in ground glass protector.

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?