Mamiya 7 65mm lens with a step-up filter ring?

Discussion in 'Medium Format Cameras and Accessories' started by Terence, May 7, 2008.

  1. Terence

    Terence Member

    Messages:
    1,346
    Joined:
    Mar 9, 2005
    Location:
    NYC
    Shooter:
    Multi Format
    I have a Mamiya 7 with a 65mm lens and a 150mm lens. The 150mm takes 67mm filters while the 65mm takes 58mm (why can't companies standardize these things when there are only a few lenses for the camera? Argggh).

    Is it possible to use a 58mm to 67mm step-up ring and just carry a 67mm filter set, or will this interfere with the lens hood?
     
  2. jd callow

    jd callow Moderator Staff Member Moderator

    Messages:
    8,003
    Joined:
    Jan 31, 2003
    Location:
    Milan
    Shooter:
    Multi Format
    Yes. I do it on the mamiya 6 -- also 58 to 67mm --with some of my filters. The 67mm is also used on two of my lf lenses. I use a thin stepup and it does not vignet.
     
    Last edited by a moderator: May 7, 2008
  3. Terence

    Terence Member

    Messages:
    1,346
    Joined:
    Mar 9, 2005
    Location:
    NYC
    Shooter:
    Multi Format
    Thanks. Does the hood still fit, or do you use a non-Mamiya hood?
     
  4. Pinholemaster

    Pinholemaster Member

    Messages:
    1,504
    Joined:
    Oct 17, 2005
    Location:
    Westminster,
    Shooter:
    8x10 Format
    Hood won't fit. You'll have to get a 67 mm hood to fit the larger filter.

    I have the same system, and think it is wonderful that they limited their lenses to only two filter sizes. Some manufacturers use far more sizes.
     
  5. jd callow

    jd callow Moderator Staff Member Moderator

    Messages:
    8,003
    Joined:
    Jan 31, 2003
    Location:
    Milan
    Shooter:
    Multi Format
    What Pinhole said...
     
  6. RobC

    RobC Member

    Messages:
    3,901
    Joined:
    Nov 5, 2007
    Location:
    UK
    Shooter:
    Multi Format
    because f4 on a 65mm lens has a diameter of 16.25mm and f4.5 on a 150mm lens has diameter of 33.33mm

    so if your 65mm lens aperture diameter was the same as your 150mm lens, then it would be an f2 lens or thereabouts and would cost a **** load of money to design and make which you would also complain about.
    Or they could make the 150 with only an f9 lens and guess what you would think about that.

    So they can't win can they:wink:

    Fact: fast tele lenses require big filter sizes.
     
  7. jd callow

    jd callow Moderator Staff Member Moderator

    Messages:
    8,003
    Joined:
    Jan 31, 2003
    Location:
    Milan
    Shooter:
    Multi Format
    Think how cool it would be to have an f/2 65mm on the 7 or 50 on the 6.

    I fall into dream state and wonder away....
     
  8. MikeSeb

    MikeSeb Member

    Messages:
    1,062
    Joined:
    Jun 12, 2005
    Location:
    Prospect (Lo
    Shooter:
    Medium Format
    This is a partial thread-hijacking, but at least it's on point! :smile:

    How ironic to stumble onto this thread--not five minutes ago I was online shopping for a ND filter for the Mamiya 7 range: the 50 and the 43 both use the 67mm filter; question is, do I need a slim or wide filter, or will the "normal" B+W F-pro (3mm thick I think) do the job without vignetting? And when I'm using the 67 filter on a 58-threaded lens with step ring, do I need to worry about vignetting due to the step ring itself?

    Thanks guys--and apologies for breaking-and-entering [the thread]!
     
  9. keithwms

    keithwms Member

    Messages:
    6,070
    Joined:
    Oct 14, 2006
    Location:
    Charlottesvi
    Shooter:
    Multi Format
    You can open up the camera, put the lens in B mode, and fire the lens with something like a piece of ground glass over the film area to check for vignetting.

    If in need of hoods, let me suggest the rb hoods, which are very inexpensive and fit standard filter threads. The 50/65 hood would seem best suited to wide work with a mamiya 7- as a travel feature, it kinda folds back a bit so you can use that in case you see some vignetting. I don't think the 50/65 hood will vignette though, it has something like a 77mm thread attachment circle, or maybe a bit larger. I can check if people are interested.
     
  10. jd callow

    jd callow Moderator Staff Member Moderator

    Messages:
    8,003
    Joined:
    Jan 31, 2003
    Location:
    Milan
    Shooter:
    Multi Format
    I use rectangular/square 100mm by 125mm (by 3mm thick I believe) ND grads on the Mamya 6 50mm with a filter holder that uses the 58 to 67mm step up ring. I don't think the filter thickness has any bearing, but others might know better.
     
  11. keithwms

    keithwms Member

    Messages:
    6,070
    Joined:
    Oct 14, 2006
    Location:
    Charlottesvi
    Shooter:
    Multi Format
    Mike I don't know offhand whether you will see vignetting with that filter because I use sixes, but if so, what you can do is use a step up to a 77 or so and put a larger diam filter on. I have also been in the habit of just holding a larger filter over the lens, that's my cheap/low-class way of using a polarizer with my mamiya sixes.