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Photo Forum / Film Photography / 35 mm / November 2005Fd lens question - iris problem
I have a 1.4 canon FD lens and the iris does not seem to work. I have tried shifting the pin over (and the iris closes), but it does not work on the barrel. I have locked the breech lock and still it does not seem to want to work off the barrel. It seems to function with the pin, when I move it - but it will only stay open or closed with no inbetween. Is there a fix for this?? Your lens is probably normal. Try mounting it on a camera and stopping it down manually. You should see a darkening of the image, and increased DOF, of course, depending on the aperture you select on the barrel. You're bound to find a manual here that can explain what you need: http://www.canonfd.com/choose.htm > I have a 1.4 canon FD lens and the iris does not seem to work. I have > tried shifting the pin over (and the iris closes), but it does not work > on the barrel. I have locked the breech lock and still it does not > seem to want to work off the barrel. It seems to function with the > pin, when I move it - but it will only stay open or closed with no > inbetween. Is there a fix for this?? I want to use it with a macro extender - and I have tried what they say here : http://www.mir.com.my/rb/photography/companies/canon/fdresources/SLRs/av1/htmls/ index6.htm It is the chrome ring that I have, and it doesn't seem to work. I looked at the manual webpage, but I don't even know where to begin! Thanks for the link tthough... >I want to use it with a macro extender - and I have tried what they say >here : >http://www.mir.com.my/rb/photography/companies/canon/fdresources/SLRs/av1/htmls/ index6.htm >It is the chrome ring that I have, and it doesn't seem to work. >I looked at the manual webpage, but I don't even know where to begin! >Thanks for the link tthough... Which macro tube are you using? If you are using a non-U tube I believe you need to use the lens in stopped down metering mode. RP© How do I do that? Right now, I don't have the tube, but getting one - but I am testing out the lens to see if it works. From what I have read, it is just a matter of moving one of the pins to the locking position (I have the chrome ringed lens) and being able to step down from there, unfortunately, it does not work. When locking the pin, the iris closes, but will not open up using the manual ring on the barrel. If I take the pin out of the locking position, the iris opens back up, but will still not step up or down. I don't want to buy the macro tube and find out the lens doesn't work anyways, so I am testing it now. >How do I do that? Right now, I don't have the tube, but getting one - >but I am testing out the lens to see if it works. From what I have [quoted text clipped - 5 lines] >but will still not step up or down. I don't want to buy the macro tube >and find out the lens doesn't work anyways, so I am testing it now. The lens needs to be mounted on a camera body for all this to work. Wherever you are getting the tube from should be able to tell you if it is a Canon U tube or not. All auto functions will work mounted on tubes with the "U" designation and they will also work when mounted to a body. When the lens is removed from the camera body the diaphragm will not work when turning the aperture ring. Am I missing something here? RP© H,mm...why won't it work without the camera? I have a 1.8 Canon FD that works fine without it? I guess I am lost here. This is an old 1972 lens, so it is FD, manual. I want to work it from the barrel, not on the camera is what I am trying to say. I am not that well versed on the working of the A-1, but they say all you have to do is pull up the flip switch on the back (counterclockwise) and it should work. If something needs to be pushed down, pulled, pressed etc is what I am wondering if I am missing... >H,mm...why won't it work without the camera? I have a 1.8 Canon FD >that works fine without it? I guess I am lost here. This is an old [quoted text clipped - 4 lines] >something needs to be pushed down, pulled, pressed etc is what I am >wondering if I am missing... On the A1. The left side of the lens has a lever. When you fold the lever forward and push it in toward the lens mount you will now stop down the lens to whatever aperture you select on the ring. Use this lever as a DOF preview with any lens or for stopped down metering when using non 'U' macro tubes and bellows. I haven't checked but I don't think any of my FD mount lenses will stop down when not mounted to a body. I do not own any breech lock lenses. RP© > I haven't checked but I don't think any of my FD mount lenses will > stop down when not mounted to a body. I do not own any breech lock > lenses. The FD lenses, or at least the later ones, need the lock ring in the `mounted' position for the diaphram to work. There is a lock spring under the ring that is pushed back by the body mount that unlocks the lock ring. Canon made a `Macro Ring' or some name, that slips into the back of the lens to unlock the lock ring for reversed macro work. Or push the lock spring down with a jewlers screwdriver...  SignaturePaul Repacholi 1 Crescent Rd., +61 (08) 9257-1001 Kalamunda. West Australia 6076 comp.os.vms,- The Older, Grumpier Slashdot Raw, Cooked or Well-done, it's all half baked. EPIC, The Architecture of the future, always has been, always will be. >The FD lenses, or at least the later ones, need the lock ring in the `mounted' >position for the diaphram to work. There is a lock spring under the ring >that is pushed back by the body mount that unlocks the lock ring. Canon >made a `Macro Ring' or some name, that slips into the back of the lens to unlock >the lock ring for reversed macro work. Or push the lock spring down with a jewlers >screwdriver... Don't think I'll ever need to use a bayonet FD like that but thanks for the info. RP© >I have a 1.4 canon FD lens and the iris does not seem to work. I have >tried shifting the pin over (and the iris closes), but it does not work >on the barrel. I have locked the breech lock and still it does not >seem to want to work off the barrel. It seems to function with the >pin, when I move it - but it will only stay open or closed with no >inbetween. Is there a fix for this?? Does it work when mounted on the camera body? RP© Go here... http://www.canonfd.com/pdf/a1.pdf and read page 56. RP© On page 73 of the manual, it says it can be done apparently... Thanks, I had actually seen that. I don't know if it is me, but I keep reading this from here : http://www.mir.com.my/rb/photography/companies/canon/fdresources/SLRs/av1/htmls/ index6.htm " All chrome-mount-ring FD lenses and FD Macro lenses are set for manual diaphragm control as follows: 1. Before mounting the lens, push the automatic aperture lever at the rear of the lens to the right where it automatically locks. 2. Mount the lens onto the accessory as usual. The diaphragm will now open and close as the aperture ring is rotated. Some of these lenses have an additional lock lever. With these lenses, the automatic aperture lever must be pushed fully to the right and the lock lever pushed to " L" to hold the automatic aperture lever in that position." So, to me that says it can be used outside the camera body. Am I just being naive? >Thanks, I had actually seen that. I don't know if it is me, but I keep >reading this from here : [quoted text clipped - 16 lines] >So, to me that says it can be used outside the camera body. Am I just >being naive? Just checking - I think from what you said earlier that you do know this, but just to be sure - the whole thing only works when the breech-lock ring is released (i.e. the position in which it rests when fitted to a body). When it is locked in the open position, the manual stop-down position is just locked solid in wide-open position. If you want to check the operation on an unmounted lens, you must first release the breech-lock ring, by pressing the tiny pin which is half-concealed by the BL ring itself opposite the manual stop-down lever. Do this, and move the manual stop down lever to "closed" (anti-clockwise, as you look at the rear of an unmounted lens). Then the aperture control ring on the exterior barrel of the lens should operate to stop down the lens. Also, in this state, the auto stop down lever (the shorter of the two radial levers on the rear) will work to open the lens from the set aperture to wide open as you move it clockwise; it is otherwise held in the default (stopped down) position) by a strong spring. Canon actually made an adapter to allow these lenses to be used reversed on a reversing ring for extreme macro work (most lenses work better reversed at above 1:1). This was in effect just a lens rear cap with the flat base removed to allow the light through; it served to release the "tiny pin" referred to above and allow the breech lock ring to release to "mounted" position. You can achieve the same thing by trepanning a rear cap, or (cheapskate mode) by using your finger nail or a pencil to release the ring. If your lens does not do this, then it may be broken. Given the length of time since FD lenses were made, and the relatively low price for which you can buy them, I doubt if a repair would be worthwhile. However, you did say that you also have a 50mm f/1.8 lens. Frankly, I would expect this to be as good (if not actually better) than the f/1.4 for macro work. I should add that I have a 50/1.8 (and numerous other FD lenses, mostly breech-lock) but not the f/1.4. I don't think there should be any difference though. David SignatureDavid Littlewood |
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