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07-18-2013, 12:48 PM   #1
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DA* 16-50 after repair

Some time ago I have damaged my 16-50 during the shooting on the sailboat during regatta. The outside barrel has been damaged and lens stop to zoom. During the repair three inside rings have been replaced and the lens itself also has been "normally adjusted".
I do not know why but now (after repair) this good lens is optically far better as before. It has been enough sharp but now it is extremely sharp and much better as some primes. I am very satisfied with this result.

07-18-2013, 12:57 PM   #2
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The service center folks would have re-calibrated the lens....
07-18-2013, 01:24 PM   #3
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Re-centered the lenses? Or what?
07-18-2013, 02:41 PM   #4
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I don't know the internal construction of the 16-50. But there are elements which are not moved against each other when focussing or zooming, but need to be fixed in exactly the correct distance to each other. With high end lenses, this exact distance will be found out individually for each copy by measurements on an optical bench, and implemented on assembling by adding shims.

When Pentax is doing it this way, they call these lenses "limited".

Service may not have trusted the used shims, or one or more of them were damaged, and they repeated the calibration process. And, obviously, did a better job than their colleages in the factory. Also, they may have been given more time to do it.

EDIT: Sometimes you'll get an improvement after such repairs have been done.

In the factory, neither the worker will get more money if he takes more time, nor the manufacturer will get more money when selling the lens.
But with such a kind of repair, the customer usually will pay per hour, so no loss for the company if he needs more time.

It will all depend on how experienced the technician is, and how much he likes his work (and sometimes, probably, how much he liked his vodka the evening before ).


Last edited by RKKS08; 07-18-2013 at 03:04 PM.
07-18-2013, 02:56 PM   #5
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At least I am very happy with my 16-50 after this repair. But I should say that the barrel construction of this lens is too fragile and vulnerable - especially when FL is 50 mm or close.
07-18-2013, 03:10 PM   #6
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QuoteOriginally posted by Grokh Quote
I am very satisfied with this result
Which repair centre did it go to? Sounds like a good place.
07-18-2013, 03:14 PM   #7
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This is an authorized Pentax service, but here, in Russia. With bears, vodka and balalaika.
07-18-2013, 03:30 PM - 1 Like   #8
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QuoteOriginally posted by Grokh Quote
This is an authorized Pentax service, but here, in Russia.
Aha. That probably explains why the technicians did a great job.

Anecdote: I recall in about 1998 I was in Moscow and had some film developed at a photo store at GUM. When I picked up the photos I was struck at how wonderful the prints looked. It turns out the young man running the small Fuji photo lab had a PhD degree in Chemistry and something else, so he knew his stuff. In Australia the people running the mini-labs are usually unskilled teens, and the results out of the minilab often show it.

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