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12-27-2010, 09:28 PM   #1
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New 55mm, focus issues anyone?

So I have the new 55 and havent really tested it wide open. I took test shots at f11 and f16 for some portraits and they looked fine. Today I took some shots with available light outside at f2.8 and they were really out of focus....thank god this wasn't a paying client.

Today I took the camera inside and setup a test target and took some shots using my 3 lenses. 75mm, 80-160 and 55mm. The 75 and 80-160 were hitting the target every time consistently the 55mm was a different story. A few were hitting the target but the majority of the shots were off. The funny thing is I cannot see a trend here. Sometimes it just flat out misses, sometimes it gets close.

All test were done with a tripod using single point focus in the center with a shutter speed of 1/125

Is anyone else seeing this? I find it weird that my older used lenses are hitting focus pretty consistently but the new lens is not.

12-27-2010, 09:39 PM   #2
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I have the new 55 ????

what f stop in the test and range??

Dof is inches at 2.8 and rocking on your heals will put you out of focus.
12-27-2010, 09:55 PM   #3
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I was shooting at f2.8 and f4 tripod mounted...so no rocking. I kept the focus spot in the same exact area for all 3 lenses. I expect focus to sometimes range slightly but what I was seeing was really bad.

I am going to do more test here in a few days. I have a shoot on thursday so I may just rotate a few lenses at that shot and see what happens. I always have my canon as a backup just in case.
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