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Thread started 12 Nov 2013 (Tuesday) 20:43
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AF works, but MF doesn't??? Ideas?

 
KirkS518
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Nov 12, 2013 20:43 |  #1

Lens is the old 24-85mm USM. The autofocus works perfectly, no issues there. But the manual focus 'skips' when you try and move the focus ring. That's whether it's switched to AF or MF. Move the ring fast, and I may get to catch, but other times moving it slowly gets it to catch. I'm going to open it up, but was wondering if anyone has experienced this before, and what the problem was. It's typically the other way around, so I thought it odd that AF works, but not MF. And no, I won't send it somewhere to be fixed (not worth it).


If steroids are illegal for athletes, should PS be illegal for models?
Digital - 50D, 20D IR Conv, 9 Lenses from 8mm to 300mm
Analog - Mamiya RB67 Pro-SD, Canon A-1, Nikon F4S, YashicaMat 124G, Rollei 35S, QL17 GIII, Zeiss Ikon Ikoflex 1st Version, and and entire room full of lenses and other stuff

  
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Rush87
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Nov 12, 2013 20:52 |  #2

The "spring" does not put enough pressure on the MF mechanism.
A good explanation with illustrations : http://thingsimdoing.w​ordpress.com …4-5-usm-autofocus-repair/ (external link)
I have encountered the problem you are describing on another lens and fixed it by increasing the bend in the spring (or washer) like explained in the article.
Its easy to fix if you have the patience to disassemble and reassemble the lens.




  
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KirkS518
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Nov 12, 2013 21:22 |  #3

That's a great tutorial, thanks. But it (and the additionally referenced repair links) talk about where both AF and MF aren't working. With mine, it's only the MF that's not working. I'm guessing some plastic thing-a-ma-jig that the focus ring moves/moves against is worn down.


If steroids are illegal for athletes, should PS be illegal for models?
Digital - 50D, 20D IR Conv, 9 Lenses from 8mm to 300mm
Analog - Mamiya RB67 Pro-SD, Canon A-1, Nikon F4S, YashicaMat 124G, Rollei 35S, QL17 GIII, Zeiss Ikon Ikoflex 1st Version, and and entire room full of lenses and other stuff

  
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Rush87
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Nov 13, 2013 07:16 |  #4

It is the same problem with different symptoms. I the spring is too weak, both AF and MF could stop working.




  
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KirkS518
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Nov 13, 2013 08:17 |  #5

Ok, sounds reasonable. :) Based on the above, I planned on checking it out, and I hope that's all it is. Sounds like a crazy easy fix. Thanks again!


If steroids are illegal for athletes, should PS be illegal for models?
Digital - 50D, 20D IR Conv, 9 Lenses from 8mm to 300mm
Analog - Mamiya RB67 Pro-SD, Canon A-1, Nikon F4S, YashicaMat 124G, Rollei 35S, QL17 GIII, Zeiss Ikon Ikoflex 1st Version, and and entire room full of lenses and other stuff

  
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AF works, but MF doesn't??? Ideas?
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