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Old March 16th, 2012, 06:25 PM   #1
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Canon 50 mm f1.2 lens

I bought a Canon fd 50mm f1.2 lens for use with my GH2. I notice when I turn the f-stop adjustment ring on the lens barrel that there are about four more clicks left when the iris opens to it maximum amount. That is, the aperture leafs reach a point and then the ring will turn approximately four more clicks with no further aperture change. Is that normal? How can I tell when the aperture is fully open?
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Old March 17th, 2012, 12:20 PM   #2
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Re: Canon 50 mm f1.2 lens

I have that problem with my adapter ring, too. It doesn't click, though, it's smooth, it just has more travel past the fully open spot.
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Old March 17th, 2012, 12:32 PM   #3
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Re: Canon 50 mm f1.2 lens

I wonder how to determine if the aperture is actually fully open.
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Old March 17th, 2012, 03:40 PM   #4
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Re: Canon 50 mm f1.2 lens

Quote:
Originally Posted by Jim Snow View Post
I wonder how to determine if the aperture is actually fully open.
Can't you just look into your lens from the front? I have a Nikkor 55mm 1.2 and when its wide open.. I can't see the aperture blades at all.
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Old March 17th, 2012, 04:56 PM   #5
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Re: Canon 50 mm f1.2 lens

That's what I'm thinking, John. Jim get a flashlight and look in if you need to. The issue is no doubt adapter related, IMO.
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Old March 18th, 2012, 12:10 PM   #6
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Re: Canon 50 mm f1.2 lens

I have a friend with the same lens. I will do a comparison and report what I observe.
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Old March 18th, 2012, 10:28 PM   #7
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Re: Canon 50 mm f1.2 lens

I reseated the lens into the adapter and it works fine now.
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Old March 19th, 2012, 09:10 AM   #8
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Re: Canon 50 mm f1.2 lens

Jim, this is why, when I used legacy lenses, I had an adapter for each lens. Changing adapters was a real nightmare on the job, wasn't even feasible, as it was so tricky for me to get it right quickly.

I'm so glad to be done with those lenses. On the other hand, because of them, I learned more than I ever wanted to know about exposure and shutter speed, which I needed to learn anyway, so that was a good thing, in the end.
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