I just received a Canon 50mm 1.8 FD lens. question for Dianne B

Started Apr 10, 2009 | Discussions thread
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S601superflow Regular Member • Posts: 387
I just received a Canon 50mm 1.8 FD lens. question for Dianne B

It looks in very good condition serial # is 6393177
I have purchased a jinfinance Canon FD to m4/3 adapter on the way too.

I am not familiar with this lens . I am concerned about the iris movement, it has a five blade iriswhen set to f1.8 with out the back cover it is open to about 5mm on each blade. if I fit the back cover it closes down to about 3mm of each blade

with the back off if I turn the ring to f22 it closed to about 1.25mm of blade if I remove the back then the iris opens again to 5mm of blade.

Is this situation normal ? Or do I have a dud?

At F1.8 should the iris be fully open? or will this only occur when placed on the adapter & camera.

Any input will be appreciated.
Thanks in advance

South Australia

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