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24-85 Preconversion test problem

 
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doctorb



Joined: 21 Jul 2008
Posts: 101
Location: North Carolina

PostPosted: Tue Aug 19, 2008 12:19 pm    Post subject: 24-85 Preconversion test problem Reply with quote

I currently have several lenses in for conversion. One of the lenses
(24-85) scored as a "O" on the AF test. All the other tests were fine.

I believe that the test results range from "Y" (passed), "O" (not recommended) or "N" (failed). My question is, has anyone proceeded with the conversion of a lens with an "O" rating on the AF and, if so, how did it perform. I can live with a slower AF but not an innacurate one.

I need to decide which way to go on this (proceed, chuck the lens, find one that fully passes). I already have about $400 sunk into this lens and the conversion will add another $400. Opinions appreciated. I am awaiting clarification and suggestions from Bo-Ming, but I would also like to know if anyone here has faced the same dilemma.

TIA
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Leo



Joined: 23 Nov 2006
Posts: 24
Location: Toronto, Canada

PostPosted: Tue Aug 19, 2008 1:52 pm    Post subject: Reply with quote

I don't have this problem on 24-85mm and it is quick and nicely reponsing to any situration. Please note that, I believed, it is not a true zoom and will have focus shift from tele to wide side. So, you need to refocus in different zoom range.

Leo
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conurus
Site Admin


Joined: 15 Aug 2006
Posts: 795
Location: Vancouver, Canada

PostPosted: Tue Aug 19, 2008 5:23 pm    Post subject: Reply with quote

Before we commence conversion we always run your lens through a Contax N1. If there are no incidents, "P" indicates a full pass.

If the lens has been sitting around unused for some time, the lubrication of the focusing mechanism may get a little bit stuck, and the AF may make a high-pitched squeak noise when tested for the first time. If it does not improve on the second trial, it would be a "F" (fail), but if there are no more problems on the second/third trial, we mark it as "O" (OK). In our experience if you "exercise" the lens regularly there will be no further problems. Otherwise, you are always covered by our 1-year ultrasonic motor warranty on the 17-35, 24-85 and 70-300 lenses.

_________________
I am a bird and I uncovered the E, EF and N-mount communication protocols!
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doctorb



Joined: 21 Jul 2008
Posts: 101
Location: North Carolina

PostPosted: Tue Aug 19, 2008 7:43 pm    Post subject: Reply with quote

Thank you for the helpful explanation.
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