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02-18-2017, 06:16 AM   #1
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Lens hazing and other problems

I have two lenses that came with ME Supers, 50mm F1.7.

One is clean but the aperture ring is sticky, it takes a lot of force to go below F8, more force than you would want to put on it so it's not just a nuisance but stops me using it. Another lens has the aperture ring running very nicely but has hazing inside.

So the question is whether these are things I can sort out myself or does doing this require some specialist knowledge or apparatus to recalibrate the lenses when put back together?

I am not sure it would be cost effective to pay to have it done, I'd probably just use another lens, but I would rather like to learn how to do it is it is deemed doable.

The one with hazing I knew about before I got it so I don't feel cheated, it came with an ME Super that didn't cost that much, but the meter was completely non operational when I tried it, however all it turned out to be was some corrosion on the battery cover inner surface, theres not even any corrosion in the battery compartment itself, after a clean it works fine.


Last edited by Frosty66; 02-18-2017 at 04:04 PM.
02-18-2017, 07:52 AM   #2
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QuoteOriginally posted by Frosty66 Quote
One is clean but the aperture right is sticky, it takes a lot of force to go below F8, more force than you would want to put on it so it's not just a nuisance but stops me using it. Another lens has the aperture ring running very nicely but has hazing inside.
Is the lens with aperture ring problem a SMC-A lens (electrical contacts)? If so it could be one or both of the "A' button springs having broken loose and moved into a place they shouldn't be. If that's the case then the fix isn't that difficult.
02-18-2017, 08:23 AM   #3
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QuoteOriginally posted by dcshooter Quote
The idea that lenses like this can be "calibrated" in any meaningful sense beyond setting the infinity position I'd a myth perpetrated by unethical lens techs trying to overcharge for simple repairs.

Presuming the haze is not cement separation, it can likely be cleaned quite easily. The question is whether you want to invest the 50 to 70 dollars it will cost for the proper tools. The aperture issue sounds like a bent ring, which can be a pain to fix.)
What would I need to buy in terms of the tools and would these be useful long term on any lenses ?

---------- Post added 18-02-17 at 08:25 ----------

QuoteOriginally posted by Not a Number Quote
Is the lens with aperture ring problem a SMC-A lens (electrical contacts)? If so it could be one or both of the "A' button springs having broken loose and moved into a place they shouldn't be. If that's the case then the fix isn't that difficult.
I must say that before I looked at the ring it very much had that feel about ot that I it was up against the A button and not at the end of a stop so you may be onto something there.

---------- Post added 18-02-17 at 08:28 ----------

QuoteOriginally posted by dcshooter Quote
Presuming the haze is not cement separation, it can likely be cleaned quite easily. The question is whether you want to invest the 50 to 70 dollars it will cost for the proper tools. The aperture issue sounds like a bent ring, which can be a pain to fix.)
I'm not sure about that, is it easy to tell the difference ? Is the hazing usually a deposit of some kind as opposed to some kind of deterioration of some coating ?
02-18-2017, 08:53 AM - 2 Likes   #4
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QuoteOriginally posted by Frosty66 Quote
I must say that before I looked at the ring it very much had that feel about ot that I it was up against the A button and not at the end of a stop so you may be onto something there.
Take a look at this thread

Pentax-A 50mm f1.7 Aperture ring repair - PentaxForums.com

02-18-2017, 09:49 AM   #5
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QuoteOriginally posted by Not a Number Quote
Is the lens with aperture ring problem a SMC-A lens (electrical contacts)? If so it could be one or both of the "A' button springs having broken loose and moved into a place they shouldn't be. If that's the case then the fix isn't that difficult.
It is not a KA, no electriocal connections on the ring, but has an A setting with a small button ro release the aperture ring onto it.
02-18-2017, 12:52 PM   #6
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What do you mean by rubber tools ?
02-18-2017, 03:17 PM   #7
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Oh I see right, thanks !

02-18-2017, 03:50 PM - 1 Like   #8
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QuoteOriginally posted by dcshooter Quote
Drain plugs, carboy bungs, and various other objects can be substituted as well. They are used to remove un-notched retaining rings, including the "name ring" on the front of lenses.
And if the name ring won't budge with your 'genuine' or improvised rubber bung then a few bits of double sided tape between the bung and the ring often do the job

Last edited by kh1234567890; 02-19-2017 at 05:34 AM.
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