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I hope that someone can help - I have a good number of FD lenses but I have been lucky with the quality I bought and have never had the misfortune of needing to pull one apart.Well I succeeded dismounting and cleaning the rear element. But I have disassembled the bayonet.
Now, as usual with nFD, I am stuck mounting the bayonet back.
I am not sure if the cams transmitting the movement from ring to diaphragm are well positionned and at what aperture the ring must be set for the cams to be properly mounted. Now I have a wide open diaphragm when the lens is mounted on the camera that can be partially closed using the open lock ring (obviously not the right operation mechanism).
Any help, pics, video links appreciated.
Thank you Tom.I hope that someone can help - I have a good number of FD lenses but I have been lucky with the quality I bought and have never had the misfortune of needing to pull one apart.Well I succeeded dismounting and cleaning the rear element. But I have disassembled the bayonet.
Now, as usual with nFD, I am stuck mounting the bayonet back.
I am not sure if the cams transmitting the movement from ring to diaphragm are well positionned and at what aperture the ring must be set for the cams to be properly mounted. Now I have a wide open diaphragm when the lens is mounted on the camera that can be partially closed using the open lock ring (obviously not the right operation mechanism).
Any help, pics, video links appreciated.
You might try searching this forum as there have been several how-to posts made over the years that relate to FD lenses.
Otherwise I am hoping that someone knowledgeable will chip in with some information or provide a link.
You might find threads labelled “#Arkive” as the ones with generally deep information - although there are many not so labelled.
Thank you Aoi. That gives some hope. I will manage to get the help of the third hand but I would be grateful if you could describe the levers manipulation.While I don't have the FDn 200mm, I have disasembled for 50/1.8, 1.4 and a few zoom lenses. To remount the bayonet, you essentially need three hands. One to hold the bayonet, one to hold the lens body, and one to manipulate the levers on the back of the mount. The mount also needs to be rotated while being mounted while the levers are being manipulated. Another reason why I stopped buying FDn lenses (image quality is excellent though...). Good luck.
I believe the stop down lever (positioned on the bottom) is spring loaded. It needs to be in the opposite of its resting place while being mounted to properly engage in the lens.Thank you Aoi. That gives some hope. I will manage to get the help of the third hand but I would be grateful if you could describe the levers manipulation.
Sounds like a continuator of the same ”trick” that is necessary to mount the lens on a camera or adapter. Had me head scratching the first time I encountered it.I believe the stop down lever (positioned on the bottom) is spring loaded. It needs to be in the opposite of its resting place while being mounted to properly engage in the lens.Thank you Aoi. That gives some hope. I will manage to get the help of the third hand but I would be grateful if you could describe the levers manipulation.
Yes, its actually one of the most difficult to repair as it has inner rotating parts. It was good of Canon to make it useable with older FL mount bodies, but sometimes not worth the effort. Also, FDn lenses use a lot of plastics which get brittle over time, so its another issue with these lenses. I guess that's just my opinion though.Sounds like a continuator of the same ”trick” that is necessary to mount the lens on a camera or adapter. Had me head scratching the first time I encountered it.I believe the stop down lever (positioned on the bottom) is spring loaded. It needs to be in the opposite of its resting place while being mounted to properly engage in the lens.Thank you Aoi. That gives some hope. I will manage to get the help of the third hand but I would be grateful if you could describe the levers manipulation.
Understood . I guess there is a desired aperture to have the lever and the aperture ring work together. Any suggestion? Wide open, closed or just a trial and error process?I believe the stop down lever (positioned on the bottom) is spring loaded. It needs to be in the opposite of its resting place while being mounted to properly engage in the lens.Thank you Aoi. That gives some hope. I will manage to get the help of the third hand but I would be grateful if you could describe the levers manipulation.
I am going to have to say trial and error. I don't remember the specifics of it. I guess I could take apart a junk 50/1.8 to test...Understood . I guess there is a desired aperture to have the lever and the aperture ring work together. Any suggestion? Wide open, closed or just a trial and error process?
I did manage to reassemble a 28 2,8 because, as for the 50, you see the golden diaphragm ring and can adjust its position to connect with the bayonet.I am going to have to say trial and error. I don't remember the specifics of it. I guess I could take apart a junk 50/1.8 to test...Understood . I guess there is a desired aperture to have the lever and the aperture ring work together. Any suggestion? Wide open, closed or just a trial and error process?
