Canon F1 (old) - cleaning up the prism

Discussion in 'Camera Building, Repairs & Modification' started by naeroscatu, Aug 22, 2013.

  1. naeroscatu

    naeroscatu Subscriber

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    I recently got a Canon F-1 (old model) at a reasonable price from the Evilbay ($87 body only). As expected it came with melted seals and mirror bumper but for the price I paid can’t complain. I cleaned up the old seals and put in new ones. Camera is in good working order and I look forward to take it out for a spin. One thing bothers me though; I can see dust in the viewfinder right behind the eyelevel window. Anyone knows if the prism can be opened so I can access the eyelevel window from the inside and clean it up? Thank you
     
  2. Tom1956

    Tom1956 Inactive

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    Not ever having worked on a Cannon, still a lot of cameras, if the pentaprism is like all the others, it can't be opened. Your dust may simply be on the other side of the viewfinder glass, which is easy.
     
  3. Yeeski

    Yeeski Member

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    At the following site, you can download a scan of the Canon F-1 Repair Guide:

    http://www.baytan.org/prak/canon.html

    Section 1.6 provides info on removing the cover on the eye level pentaprism which should give you access to the eyepiece and pentaprism.
     
  4. naeroscatu

    naeroscatu Subscriber

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    Thank you Yeeski, that s very helpful.

    Tom, rest assured I cleaned up the viewfinder glass on the outside. What I see is on the inside, whether it is dust or a multitude of little stains - hard to tell.
     
  5. Tom1956

    Tom1956 Inactive

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    That's what I meant--the inside of the viewfinder glass.
     
  6. Mackinaw

    Mackinaw Member

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    I took apart and cleaned my F-1 prism years ago. Not terribly hard, especially if you follow the PDF that Yeeski has provided. The only thing I found confusing was the long rectangular metal piece that fits below the eyepiece with the prism removed (I believe piece #5 in the PDF). It's glued to the prism housing so will have to be pried off before removal. Once this is off, the prism housing should come right off. Or at least that's how I remember it.

    Jim B.