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on Mar 30, 2017 7:07:20 GMT
Last Edit: Mar 30, 2017 7:11:58 GMT by johnny001
Hi guys my name is Johnny and i did something stupid I declicked my yashica ml 35mm lens but i F up the aperture. For 2 days now i am trying to figure out how aperture is placed in what order In this image no aperture. Now here i have blades sitting in but every blade has this tiny metal extrusion facing up and plastic cup would sit on top but still it would not work blades would not move since plastic cut is siting on top of them Now in this image i have only 3 blades in where tiny metal extrusion is upside down sitting in a hole. I cant fit 3 other blades since other ones are covering the holes Extrusion on blade Cup that goes on top of blades The cup I am going crazy here any help would help Thanks guys
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on Mar 31, 2017 2:10:56 GMT
Posted: Mar 31, 2017 2:10:56 GMT
Welcome to the forum, Johnny. I'll try to help you here.
When you put the blades back in, you need to overlap each one. This means that by the time you get to the last one, you'll have to slip it in there between two blades. It's tricky, but can be done with a little mechanical help.
The idea is to install the blades at their minimum aperture position. You set the lens barrel flat on a clean surface, and put something like a plastic bottle cap that fits in the lens barrel hole, and is about the same height as the aperture blade deck (plastic is preferred because you can trim it to the proper height). This will keep the blades from falling through the lens hole.
Start putting the blades on, working your way around the periphery until you get to the last one. You will have to slightly lift a blade or two with a right-angle tool of some sort (can be as simple as a long pin bent into an L shape) to be able to slip the last one in, and that's why the support is needed.
After the blades are all in, put a small piece of painter's tape in the center of the blade stack to hold them in place, making sure it is smaller than the diameter of the retaining cup, and then install the retaining cup. After you make sure the blades are seated correctly in the cup, and you have the cup secured so the blades will no longer fall out, you can remove the painter's tape to see if the blades move freely when the blade ring pusher is actuated.
Be very careful when removing the painter's tape, as you don't want it to raise the blades to where they get bent, so it's best not to attach it very securely. You can also hold down individual blades with something like a toothpick while you slowly remove the tape.
Don't feel bad if it takes more than one try. It's not the easiest job to do.
PF
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