Found 6x8 film back for Mamiya RB

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uranylcation

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Jan 23, 2024
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Salt Lake City
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Looking for a 6x8 back. As long as no light leak, cosmetic condition does not matter much. I'm in Salt Lake City.
 

bellyface

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Jan 4, 2007
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san antonio
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You’re seeking the motorized 120/220 6x8 back. This back can be used on all models but you get the full 6x8 treatment on the Pro-S and newer models. I found this out the hard way. This guy has an awesome write up on the 6x8 and how to get the full 6x8 https://rb67.helluin.org/2011/02/09/qa-6x8-on-the-rb67/
 

Donald Qualls

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FWIW, you can use a Graflex 23 or RH8 on the RB -- there's no dark slide lockout or double exposure lock support, but you'll get every millimeter your body's baffles allow at the cost of one frame per roll (8 vs. 9). Lots cheaper than the motor drive 6x8 back...
 

Ardpatrick

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Sep 7, 2023
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Ireland
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Do these mamiya 6x8 motorized backs fit a graflok back of a 4x5 with an available adapter?

Of course there are many 6x7 and 6x9 Rollfilm back options available, but not so many 6x8 backs. I really like the 6x8 aspect ratio.
 

Donald Qualls

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I've got an RB67 and a couple Graflex 2x3 roll backs, anything that mounts to a 2x3 Graflok will attach to the standard RB67 rotating back.
 

Donald Qualls

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I don't have an RZ, but I haven't found anything that fits my Century Graphic that won't mount on my RB67. So far, that includes Graflex 22, 23, RH10/RH20, and 2x3 Grafmatic. The 23 and (I presume, haven't tried them yet) Grafmatics will accept the maximum 56x77 frame any RB can put on 120 or 2x3 film.

@uranylcation Does that Horseman 6x9 back mount on other 2x3 Graflok backs? I seem to recall the Horseman backs being a little over length for the standard mount.
 

MattKing

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Don't forget that the viewing system on the RB only shows ~7cm x ~7cm.
 
OP
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uranylcation

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Jan 23, 2024
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Salt Lake City
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Medium Format

Both Horseman 6x9 back and Grafmatic 2x3 back mount on my 6x9 view camera, although the Grafmatic feels a bit loose when mounted. The Horseman would not get on the RZ through G adapter, wheras the Grafmatic works fine.
 

Donald Qualls

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Looks like Horseman is/was only "mostly compatible" with the Graflok standard. Lock-in, or simple negligence, or they weren't ever claiming to be standard compliant?
 
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