Instructables

How to repair a zoom telephoto lens and mount it on your DSLR camera

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Step 5: The Iris

If the iris is working then fine. In the case discussed here , the iris was in place and it is operational but it was obviously handled by a ring close to the camera which was missing. Although there was a way to do something similar I selected to immobilize the iris in the open position, by placing a plastic tube through an opening in the focusing lens compartment.
 
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