Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,524   Posts: 1,543,842   Online: 893
      
Results 1 to 4 of 4
  1. #1

    Join Date
    Sep 2010
    Location
    Switzerland
    Shooter
    35mm
    Posts
    376
    Blog Entries
    1
    Images
    28

    Odd stuck mirror problem on Canon F-1n

    Because we don't have enough threads on FD gear already, here's another one. I've been having a rather strange problem with my Canon F-1n (2nd, mechanical version, not the New F-1). Sometimes, the mirror gets stuck after an exposure and doesn't return to its viewing position. The shutter closes, but the mirror stays up. The only way to get the mirror down is to dismount the lens. The odd thing is, this only happens with my FD 50mm f1.4, and only at 1/125th shutter speed. All other speeds are fine, and so are other lenses at 1/125th. I don't have another camera body right now to test the 50mm, but I know it works flawlessly and doesn't have any bent or crooked parts that I can see.
    I tried cocking the shutter prior to mounting (I always do that anyway), but that doesn't fix the problem. Also, the mirror doesn't get hung every time, only about once in five times.

    So, what's happening there? There are small scratches on the side of the mirror, indicating that it rubs against the rear side of the lens. But why, and how, and and and... I'm confused
    And the sign said, "long haired freaky people need not apply"

  2. #2

    Join Date
    Feb 2009
    Shooter
    Large Format
    Posts
    662
    It should be impossible for any part of the lens to contact the mirror. The only explanation I can think of is that the rear cell might be partly unscrewed.

    That would place it too far rearward and possibly it might then contact the swinging mirror. If this is the case, then by screwing the rear cell fully into position, it should move forward and clear the mirror as it is supposed to.

  3. #3

    Join Date
    Apr 2004
    Location
    Montgomery, Il/USA
    Shooter
    Multi Format
    Posts
    5,095
    If you can get the mirror to hang, see if it will release by pushing the curtain gently to the left. If it releases, then the curtain tension needs to be adjusted.
    BTW, no film in the camera =)
    Heavily sedated for your protection.

  4. #4

    Join Date
    Jan 2005
    Location
    One hour south of the Mackinaw Bridge
    Shooter
    Multi Format
    Posts
    311
    Have you used the cameras' "mirror lock-up" mechanism? Does the mirror easily go up and easily go down when engaged? Any binding or rough action?

    Jim B.



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin