Lens Stuck on T70 Body

Discussion in 'Canon FD' started by joshyarbrough, Oct 14, 2017.

  1. I was given a T70 and it has this lens on it (description below) without the lens release button. I can’t seem to get the lens off the camera. Is there a trick to getting it off or did the previous owner put a lens on that I’m going to have to force off and hope for the best?
    Macro mc zoom 67 M850231503 GEMINI 1:3.5-4.5 35-200mm
  2. Just to be sure we understand, this is a FDn style lens, with a release button. Not a FD-style lens with the breechblock ring. Correct?
  3. Honestly I have no clue. I’m am not familiar with the canon lenses as this was given to me. The camera came with additional lenses with the release button on those but not on the one currently on the camera. The one that i can’t get off the camera was already on there when I got It.
  4. See if there's a knurled or serrated ring on the lens right next to the camera body. Try rotating it counter-clockwise(as your facing the camera). After about 1/4 turn, the ring should "lock" and you can then pull the lens straight off the body.

    The fact that it doesn't have an obvious release button makes me think it's the breech lock style described above.

    The breech lock ring is usually matte aluminum, but I've seen it black on 3rd party lenses. Also, there are not very many 3rd party lenses that use the "new" style mount with a release button.
  5. awahlster

    awahlster Moderator

    All aftermarket lenses in the Canon FD system use a locking ring on the back of the lens like a S.S.C. lens does rather then a nFD type locking button. The only kind of exception to this is the Sigma lenses which have a locking ring with what looks like a locking button.

    Grab the ring on the lens closest the body and turn it to the right holding the camera as if looking through the view finder.
  6. There should be a red dot on the knurled ring. Turn the ring to where the red dot is at 12:00 o'clock

    You might also want to look at an instruction manual for an older Canon such as an FTb which will explain the lens mount system. This is the place to look: CANON Camera Manuals, canon Flash manuals
  7. The ring is black and I can see the red dots for aligning the lens but it doesn’t move. I’ve turned it on and triggered the shutter to see if it would release but that didn’t work..I noticed though that in order to trigger the shutter I have to press twice. It’s like it’s stuck in bulb mode.
  8. I've heard that a breechlock mount lens can be tightened so tightly that it becomes stuck. You may have to grip the lens and twist as hard as you can to untighten the lens. You may even have to resort to using some sort of tool. As for your other problem, you can worry about that once you remove your lens.
  9. ok..i have successfully removed the lens. i have been messing with it all afternoon and got exhausted fooling with it so i set it down and right before i'm getting ready for bed i picked the camera up to put in the camera bag and gave it a final twist for the night and it came right off..go figure..thanks for everyones help...tomorrow i'll give it run with some test shots and see what kind of trouble i might have with the shutter? hopefully it was the lens that was making the shutter respond the way it was.
  10. Glad to read you got the lens unstuck. Sometimes they can get jammed pretty tightly. Awahlster is correct, to my knowledge. No aftermarket lens maker adopted the overly complex design of the New FD mount. Why should they, when the breechlock worked so well? And Awahster is also correct about Sigma. Their clever design with the little red button looked to function like a New FD lens, but it was just a disguised breechlock mount.

    The lens should not affect the shutter, unless you have the T70 in one of the auto-exposure modes. Then, if the camera is in fairly dim surroundings, the camera may time out with a longer exposure.

    Be sure to put fresh batteries in the camera. And you might want to visit Mike Butkus's site and d/l a pdf of you camera's manual. Be sure to shoot him a couple bucks for his troubles if you can spare it. Here's a link to the T70's opening page at Butikus's site:

    Canon t70 instruction manual, user manual, PDF manual, free manuals
    Last edited: Oct 16, 2017
  11. I recall reading an analysis (Keppler in Pop Photography?) of Canon's then new bayonet mount in which he said that Canon developed the bayonet mount: 1) to be just like everyone else's bayonet mount; and 2) to stop third party lens manufacturers from making lenses for Canon cameras. I always thought the breech lock mount, especially the later spring loaded FD ones that mysteriously turned 1/8 turn as soon as you pressed it against the body mount, was at least as easy if not easier to use than most bayonet mounts which makes me believe the main reason Canon switched was to lock out third party lenses.
  12. Kepler wrote for Modern Photography for decades, then after Pop Photo bought Modern, he wrote for Pop Photo for the rest of his life.

    But I'm not buying his argument. Reason is because Canon did not change the body mount, so this didn't slow down 3rd party makers one iota. They just ignored the overly complicated New FD mount. As for why Canon went with it, I really do believe they wanted to make things simpler for the user. Many folks find they have to use both hands to mount a breechlock lens. And even if you're experienced and you use one hand, it does require some dexterity and practice if the lenses don't have that "mysterious" breech lock ring.. Whereas attaching an nFD lens is about as straightforward as attaching any other bayonet mount lens.
  13. I think the "New" FD mount is a great example of clever engineering. Canon probably lost some sales because people preferred bayonet mounts. This new lenses gave them that feature without making existing Canon users go out and buy a whole new set of lenses and cameras.

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