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06-19-2012, 11:50 PM   #1
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confirm a 50-135 problem

Hi all,

Just got my 50-135 back from CRIS (it took a nasty spill and lost all zoom and focus capabilities). The motor, board, and other components were replaced.

It's lovely to have it back, but I noticed that there are no "stops" or limits to the rotation of the focus ring, and I can't remember that being the case. That is to say, if I rotate the ring to infinity, I can "feel" (and see, in the distance scale) that I've reached the limit, but I can also continue to rotate the ring past that point (the distance scale stays fixed, however, and focus doesn't actually change). The focus ring also feels "grittier," especially past the stops at minimum focus and infinity.

Wondering if I need to send back to CRIS, or if this is typical behavior for the 50-135 focus ring?

thanks!

-s

06-20-2012, 12:07 AM   #2
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that sounds about normal for all SDM lenses i've used
06-20-2012, 01:21 AM   #3
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That's how these lenses work. My 16-50 does that. You know when you reach the limit by that little resistance.
06-20-2012, 02:28 AM   #4
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normal

06-20-2012, 04:33 AM   #5
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the DA*55 do that too. So i guess it's normal.
06-20-2012, 05:12 AM   #6
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backfocus

i hope it is ok to ask another question on this lens on the same link...we just got a new one from b&h and it is definitely back focusing...tried to go as far as 10 but it still is not great...seems to work better at the 135mm range at 10 but doesn't work for the 50mm range...i will be sending this back but just curious if anyone has experienced this problem recently..thanks, amy
06-20-2012, 05:45 AM   #7
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Autofocus accuracy is something between camera and the lens, they all have some lee way sometimes they cancel each other out or they enhance the error.

I had the same problem with Sigma 30mm bought new and simply return it for a new one and that focused almost perfect on my camera.
06-20-2012, 12:34 PM   #8
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Thanks all! I'll go back to just being happy to have my baby back .

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