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Need advice on problem 28-135 focus

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macronut View Drop Down
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Post Options Post Options   Quote macronut Quote  Post ReplyReply Direct Link To This Post Topic: Need advice on problem 28-135 focus
    Posted: 04 June 2019 at 20:39
I just bought a Minolta Maxxum 28-135, Itís the one they made with the focus ring in the rear. The ďSecret HandshakeĒ lens.   

Seller advertised it as new In the box. By all accounts it appears new and feels new. For example, This model is notorious for developing zoom creep because of how heavy it is. I would say a safe bet is that 50-75 percent of these on the used market have zoom creep. On this particular copy, I could instantly tell it feels new. The zoom has no creep and the tightest, most precise movement Iíve ever felt in this model.   It shows no signs of use Mechanically or cosmetically.   But it has a problem. The focus ring turns normally until it hits a certain spot and then something inside catches. Not enough to stop it. I can turn past this difficult point. But something is clearly wrong. Almost like a gear has a bad tooth or there is a foreign object inside.

I need to decide how to proceed. Iíve said nothing to the seller so far. Seller knows nothing about photography gear. I could send it back, but I really want to keep it if fixing the problem is no big deal.   Iíve considering sending it to a repair shop. Iíve cinsidered opening it up and looking for myself. That being said, Iím no repair guy by any means. Maybe I could see the problem at least?


Edited by macronut - 04 June 2019 at 21:03
Only from the mind of Macronut.
 



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5thElefant View Drop Down
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Post Options Post Options   Quote 5thElefant Quote  Post ReplyReply Direct Link To This Post Posted: 04 June 2019 at 20:45
Mine started doing this after 10 years in my possession. Not very helpful, but Iím interested rested too...
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macronut View Drop Down
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Post Options Post Options   Quote macronut Quote  Post ReplyReply Direct Link To This Post Posted: 04 June 2019 at 20:59
Maybe the lube has dried out?

I have a mint copy already (no creep, no cosmetic blemishes) that I bought years ago here on Dyxum. Paid a lot for it, back before the bottom fell out of prices. Seller advertised it as mint and it is mint, with zero zoom creep. But I will say that the one I just bought is set apart by the fact that the zoom is slightly tighter, with a harder to move feeling. It feels exactly like a first generation 50mm macro I recently bought as ďnew in boxĒ. Feels like it has never been zoomed out.   So I was quite surprised by the focus ring problem.
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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 04 June 2019 at 21:04
The 28-135 a pretty straightforward lens to take apart. I've done it a few times. The repair manual is available.

I recently bought a 24-50 F4 that was described as clean that had a bunch of sand in it jamming the focus rack. I wouldn't recommend continuing to force it past the sticking point.
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Post Options Post Options   Quote mirthseeker Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2019 at 02:46
Pete Ganzel has done a guide to repair the 28-135.

Note the procedures further down each page. Beware not to lose the ground spring below the Contact Board (use a toothpick to remove and store it).

Edited by mirthseeker - 05 June 2019 at 04:08
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jackal2008 View Drop Down
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Post Options Post Options   Quote jackal2008 Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2019 at 02:58
try to "warm" it up by manually turning the focus ring back and forth, say 100 times. See if any improvement. Could be lube issue.
 



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jackal2008 View Drop Down
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Post Options Post Options   Quote jackal2008 Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2019 at 03:00
I have a 100mm macro which would stuck randomly. But if I warm it up each time I use it, it's fine.
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macronut View Drop Down
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Post Options Post Options   Quote macronut Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2019 at 11:36
I nderstand what youíre saying, but that is a little unnerving.   I would kick myself if I caused damage.

Last night I played with the focus ring just a few times. Now it is slightly catching in another spot, a little bit before the first spot I discovered. Makes me think I am breaking loose some dried-out lube. Maybe I should just send it out for a CLA service. This lens was a hidden gem inside an auction listing, so I did well on it.
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macronut View Drop Down
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Post Options Post Options   Quote macronut Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2019 at 14:14
Thanks for the link Mirthseeker
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