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  1. #1

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    Mamiya RB67 6x8 Power Drive to Produce 6x7 or 6x4.5

    I am waiting on my new RB67 Pro SD to arrive (the body + lens at least)--in the meantime I am trying to find the back I want.

    I want to find a 120 Pro SD back, but those seem to be hard to find at a decent price. To me it would be easier to find the SD back and never worry about replacing the foam light seals.

    I recently found a 6x8 120 Power Drive back--does anyone now if this will produce clean (no vignetting) 6x8 negatives, OR 6x7 negatives? The manual reads "You can use 6x7, 6x4.5 format, with the light baffle frame mask for 6x8 format mounted on the camera body"

    To me that says--you can use the 6x8 back, but with a 'light baffle frame mask' you can produce 6x7 or 6x4.5 negatives as well. To me, it wouldn't matter if the size was 6x8 or 6x7 as long as it didn't have vignetting or the like.

    Does anyone have experience with this?

  2. #2

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    I got one.

    With mine,
    In horizontal position, bottom right and bottom left corner gets slight vegnetting. All other sides are clean and sharp.
    In vertical position, all along the top edge is vegnetted a little. That side isn't clean and sharp. All other sides are fine.
    There is no way to produce anything other than 6x8.

    If you use mask (never heard of it except for the mask you'd place in the focus screen area), you should be fine. I think they are stretching a bit on this 6x8 back. It's really not 8 cm wide either. It's actually 7.55cm in horizontal and 7.5cm in vertical.

    EDIT: by the way, I do have an SD body.
    Develop, stop, fix.... wait.... where's my film?

  3. #3

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    Yesterday, KEH listed 120SD back. In about 10 minutes, it was GONE.
    If you hurry, you can get 6x4.5 back for 72 dollars.
    Develop, stop, fix.... wait.... where's my film?

  4. #4

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    It makes me wonder why they came out with the 6x8 back at all...

    Yeah I will be watching KEH...I am not interested in the 6x4.5 unfortunately--I have a Fuji rangefinder for that!

  5. #5

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    I called Mamiya and asked about this back. The representative said they didn't sell very many of them. Apparently, it wasn't very well received in the market place. Rumor has it Mamiya wanted to compete with Fuji that had 6x8 capability. This is more like 6x7.5. Really not worth the effort....

    I keep trying to get a working 6x7 back. The last one I got, an SD type with near mint condition had light leak. Non SD type with foam seal were a mess.
    Develop, stop, fix.... wait.... where's my film?

  6. #6
    MattKing's Avatar
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    The biggest advantage of the 6x8 back is that all your negatives will fit on a single Printfile sheet

    Actually, the power wind is handy, and the built-in 120/220 compatibility isn't bad either.

    And when someone refers to a 4/3 format camera, you can whip out your RB67 with this back and say (preferably with an Australian accent) "4/3 format? Now this is a 4/3 format!"
    Matt

    “Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”

    Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2

  7. #7

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    Every time I try a foreign accent, it sounds Asian... why is THAT?
    Develop, stop, fix.... wait.... where's my film?

  8. #8

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    RB67 6x8 back

    Hi,
    I have 6X8 back on a RB67 ProSD. The 6X8 Back on RB67 ProSD gives a 56x76mm size negative in vertical direction and 56x73mm in horizontal direction. I get 9 frames per 120 roll. The back is only for 6X8 size; it cannot be used for 645 or 6x7. However 6x8 back can be adjusted to take 220 film. There is comparison picture with a 645 back in the link below:
    http://www.flickr.com/photos/yazici/...in/photostream

  9. #9

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    Quote Originally Posted by al5256 View Post
    Hi,
    I have 6X8 back on a RB67 ProSD. The 6X8 Back on RB67 ProSD

    Hi

    Do you see the symptom I described about top edge not being crisp on vertical and vignetted corners on horizontal but long end actually a bit longer with crisp edges? I've been wondering if this is common on ProSD with 6x8 back. I can scan my film and post it if my description is confusing.
    Develop, stop, fix.... wait.... where's my film?

  10. #10

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    Quote Originally Posted by tkamiya View Post
    Hi

    Do you see the symptom I described about top edge not being crisp on vertical and vignetted corners on horizontal but long end actually a bit longer with crisp edges? I've been wondering if this is common on ProSD with 6x8 back. I can scan my film and post it if my description is confusing.
    I read somewhere that the light baffle of the body has to have an '8' marked on it--but it is still not clear whether or not this produces crisp edges.

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