T-adapter on an Mamiya RB67?

Discussion in 'Medium Format Cameras and Accessories' started by kb244, Oct 7, 2006.

  1. kb244

    kb244 Member

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    Aside from the obvious issue of weight and bulk on the back of a scope and such, to which if I could would just setup some kind of a tripoded raile to hold both the camera and scope so that one or the other is not bearing weight down on it. So this thread is basically based on curiousity, not out of nessesity since I have other means of doing what I want.

    The quick question is.... do T-Adapters exist for some medium format cameras.

    The details of what I've been using:
    Celestron C90 Mak with the camera adapter tube as picturered here (click image for more images).
    [​IMG]

    The nice thing about the scope is that I can view down from the top if I wish, but also from the back. Also the back peice you can remove the eyepeice holder or angle viewer and attach the T-Adapter for the scope itself. Allowing me to view from the top and switch to the bottom with a camera attached. The direct path on the back does not go thru an eyepeice at all but straight into the camera. The scope is a 3.5" (90mm aperture) Maksutov-Cassegrain Spotting Scope and is waterproof so both front and back are closed off.

    More information about the scope can be seen at the manufacture's website here http://www.celestron.com/c2/product.php?CatID=30&ProdID=203 (though its interesting, I didn't think they would be using my picture at the bottom :tongue:)

    Far as the camera I been using on the back, I've used my digital rebel, Canon EOS-1, and Canon FTb via either the EF or FD T-Adapter for the camera itself, but been wondering bout the possibility of using something such as my RB67 on the back of the scope, and higher speed film.

    My main concern is actual coverage, I wouldn't be using a eyepeice on the scope, so its whatever the back of the scope can output, but not sure exactly what coverage it can give even with maybe some distance between the film plane and the scope. I suppose if I riged up some kind of rail with the scope and RB67 on it, and maybe UV or some other form of protector so I Can leave the front of the RB open, then extend the distance back and forth between the scope and the RB67 to see where I get focuse, based on focusing off the top of the scope first, then mvoing the RB67 back and forth on the back.

    Your Thoughts?

    PS: What would be real fun is to be able to do it to a 4x5 :tongue:, though I doubt that even more.
     
  2. Dan Fromm

    Dan Fromm Member

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    T-mount's register is 55 mm. That's enough longer than all 35 mm SLRs to make the system work, but is, I think, shorter than any roll film SLR's register.

    On the other hand, my late absolutely unlamented Celestron C-90 had an extension tube that went between that back of the barrel and the male T-mount. If your 'scope has one, perhaps you can cobble up an adapter.
     
  3. kb244

    kb244 Member

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    ya same adapter I Got for mine, its like a tube one connects to the scope, the other end allows for the T-adapter of the camera to screw on.
     
  4. Dave Parker

    Dave Parker Inactive

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    I am pretty sure you would have to make one Karl, I looked for a couple of different models of MF gear I had for an adaper without success, the only thing I found was a guy in europe that would make an adapter for just about anything, but his costs were way up there, like 2-$400 depending on the application, you could probably find a bad lens and then remove the mount and make something.

    Dave
     
  5. kb244

    kb244 Member

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    Hrm or I can get ahold of an extension tube and butcher that.

    But what about an 'open' system for lunar shots at the dark of night.

    For example as described, a rail with both the scope and mamiya on it, then the rail attached to the tripod. Then I would move the RB up and down the rail to acheive 'focus', but nothing in between the RB and scope. If an open system would not work, I would probally have to rig some kind of bellow extension tube to connect between the scope's back end and the RB's front.
     
  6. Dave Parker

    Dave Parker Inactive

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    Karl,

    I will have to take a look, there was an article several years ago in Shutterbug about making an adjustable extension tube out of PVC that would probably work for this application, the key seems to be the mount for the camera, I will dig around and see if I can find it...

    Dave
     
  7. wirehead

    wirehead Member

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    Also remember that the RB67 is designed for leaf-shuttered lenses, so there's no focal plane shutter.

    I think you'd get better results by making an adapter with a t-mount on one side and a mount for the back on the other side.
     
  8. kb244

    kb244 Member

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    Good point.