Canon 50 mm f1.2 lens at DVinfo.net

Jim Snow · March 16th, 2012, 05:25 PM

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?

Patrick Janka · March 17th, 2012, 11:20 AM

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.

Jim Snow · March 17th, 2012, 11:32 AM

I wonder how to determine if the aperture is actually fully open.

John C. Chu · March 17th, 2012, 02:40 PM

Quote:

Originally Posted by Jim Snow

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.

Jeff Harper · March 17th, 2012, 03:56 PM

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.

Jim Snow · March 18th, 2012, 11:10 AM

I have a friend with the same lens. I will do a comparison and report what I observe.

Jim Snow · March 18th, 2012, 09:28 PM

I reseated the lens into the adapter and it works fine now.

Jeff Harper · March 19th, 2012, 08:10 AM

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.

March 16th, 2012, 05:25 PM	#1
Jim Snow Trustee Join Date: Mar 2009 Location: Santa Clara, CA Posts: 1,104	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?

March 17th, 2012, 11:20 AM	#2
Patrick Janka Major Player Join Date: Jan 2010 Location: Orlando, FL Posts: 623	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.

March 17th, 2012, 11:32 AM	#3
Jim Snow Trustee Join Date: Mar 2009 Location: Santa Clara, CA Posts: 1,104	Re: Canon 50 mm f1.2 lens I wonder how to determine if the aperture is actually fully open.

March 17th, 2012, 03:56 PM	#5
Jeff Harper Inner Circle Join Date: Jun 2005 Location: Cincinnati, OH Posts: 8,425	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.

March 18th, 2012, 11:10 AM	#6
Jim Snow Trustee Join Date: Mar 2009 Location: Santa Clara, CA Posts: 1,104	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.

March 18th, 2012, 09:28 PM	#7
Jim Snow Trustee Join Date: Mar 2009 Location: Santa Clara, CA Posts: 1,104	Re: Canon 50 mm f1.2 lens I reseated the lens into the adapter and it works fine now.

March 19th, 2012, 08:10 AM	#8
Jeff Harper Inner Circle Join Date: Jun 2005 Location: Cincinnati, OH Posts: 8,425	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.