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[title] Iris lock at a fixed value
[* black] If you want to lock the iris at a fixed F-value (as I did), you don't need to remove the iris ring.
[* black] Take out the blade over the gear from its pin, turn it to have space and then you can remove the small plastic gear with small tweezers . Put back the blade on its pin.
[* black] I suggest to lock the iris ring with some small pieces of adhesive tape. You can see 3 of them in the 1st picture.
-[* black] I decided to set the iris at around f:4. The fully open iris (f:2) has a diameter of around 11.5mm, so I closed it to 6.7 mm to get f:4 (I used a digital caliper to measure it) and then I locked the ring with some tape. In the 2nd picture you can see the final result.
+[* black] I decided to set the iris at around f:4. The fully open iris (f:2) has a diameter of around 13.5mm, so I closed it to 6.7 mm to get f:4 (I used a digital caliper to measure it) and then I locked the ring with some tape. In the 2nd picture you can see the final result.
[* black] If you don't need to remove the iris ring, you can stop here , go back and reassemble all parts. If you want or need to remove the iris ring, go further.