Bay I to Bay II adapter?

Discussion in 'Medium Format Cameras and Accessories' started by Toffle, Sep 11, 2008.

  1. Toffle

    Toffle Member

    Messages:
    1,848
    Joined:
    Mar 27, 2007
    Location:
    Point Pelee,
    Shooter:
    Multi Format
    I've been looking for a bay II Rollei Infrarot filter (lens) for some time now, with no luck whatsoever. Now I see an auction for a Bay I filter, and I'm thinking this could be my only opportunity to pick one up.

    My question is, is there a Bay I to Bay II adapter available? I don't know how much smaller Bay I is, but I'm wondering if there would be significant vignetting if it is too small.

    Any opinions?

    Cheers,
     
  2. Andy38

    Andy38 Member

    Messages:
    185
    Joined:
    Aug 16, 2008
    Location:
    Lyon , Franc
    Shooter:
    Medium Format
  3. JPD

    JPD Member

    Messages:
    842
    Joined:
    Mar 24, 2007
    Location:
    Sweden
    Shooter:
    Medium Format
    The original poster has a camera with Bayonet II, and wants a Rollei Infrarot filter (that automatically compensates for the focus shift with IR-film). There are Bay II Rollei Infrarot filters out there, so keep searching. A new B+W or Heliopan filter is an option, but then you would need to use the trial and error method to learn how much you need to compensate for the focus shift manually.

    I've never heard of a "step down" Bay I to II adapter
     
  4. Steve Smith

    Steve Smith Subscriber

    Messages:
    9,083
    Joined:
    May 3, 2006
    Location:
    Ryde, Isle o
    Shooter:
    Medium Format
    What about a Bay II to 46mm or 49mm?

    I have a Bay I to 46mm which I use with a polariser.


    EDIT: I see that's what Andy38 suggested.



    Steve.
     
  5. Toffle

    Toffle Member

    Messages:
    1,848
    Joined:
    Mar 27, 2007
    Location:
    Point Pelee,
    Shooter:
    Multi Format
    Yes, I'm looking for a genuine Infrarot, which as JPD has said, compensates for the IR focus shift. I think I will just have to be patient and be ready when an appropriate filter becomes available. I see that the Bay I Infrarot on ebay yesterday went for $66, which seems fairly reasonable. Up to now, I have been using the very scientific process of holding an R-72 in front of my taking lens, :D which I've only screwed up once in about a half-dozen rolls.

    Cheers,
     
  6. ic-racer

    ic-racer Member

    Messages:
    7,470
    Joined:
    Feb 25, 2007
    Location:
    Midwest USA
    Shooter:
    Multi Format
    I'd pick up the Bay I filter. Good excuse to go ahead and get a 'spare' camera with a Bay I lens (Yashica, Rolleicord, Rollei-T, older Rolleiflex etc.)