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07-07-2016, 06:49 AM   #1

Join Date: Sep 2011
Location: Richland, Washington, USA
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Can a decentered lens be repaired

As the title says. I have a lens that looks to be decentered. It's very sharp in the center and good along 3 edges, but the 4th edge is pretty bad, even stopped down to f8. Can it be repaired? If so, any suggestions where? Already contacted Eric and he can't.

07-07-2016, 07:32 AM   #2
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Location: Nashville, IN
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I had a decentered Tamron 17-50 repaired by the Tamron service center, so I know they can be repaired. I'd check with the manufacturer to see if they can do it at one fo their centers and also check with KEH since they do lens repairs.
07-07-2016, 08:06 AM   #3
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What's the lens?
07-07-2016, 10:10 AM   #4
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I had a Limited 35 Macro with the symptoms you describe. I sent it to KEH, the lens was repaired to my satisfaction, cost $130.

07-07-2016, 02:01 PM   #5

Join Date: Sep 2011
Location: Richland, Washington, USA
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Original Poster
FA 20mm. Looked great on my K-3, not so great on the K-1. I'm guessing Precision Camera is the place to go, but if someone knows a better alternative I'm all ears.
07-07-2016, 02:39 PM   #6
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I haven't opened one of these up, but if it is built like the FA 50mm 1.4, the elements are all held in with metal retaining rings, and any tech should be able to check if any of them are mis-seated. If the problem is in the cemented group, it would require either recementing or replacement of the affected group.

If the construction is more like the FA 50mm 1.7, then the groups are directly molded into a plastic assembly and can't be adjusted. I'd be more inclined to think it is the metal rings, since it is a more expensive lens.
07-10-2016, 03:41 PM   #7

Join Date: Apr 2007
Location: Oklahoma USA
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I think the answer is "it depends", on at least three factors. One would be the construction of the lens: for some lenses the construction would probably make such repairs impractical. Another would be availability of the proper equipment to identify and repair the problem. The third would be your ability to convince the service provider that the lens is indeed "out of spec", which has been a specific problem for me.
07-13-2016, 01:58 PM   #8
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An FA20 is quite rare and may well be worth investing in if it has no other faults.


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