DA* 50-135 SDM autofocus problems.


grahamcoad

Link Posted 28/10/2013 - 15:12
Some time ago I bought a Pentax DA* 50-135mm lens through Ebay. The seller advertised it as being perfect optically and cosmetically but with a slow, hesitant and erratic autofocus.

Naturally I was able to get it at a very good price, and have used it as a manual focus lens..

Recently I had some funds spare so sent the lens off to Pentax UK's servicing people who got the lens back to me well packed in about ten days, having fitted a new SDM Motor and PCB (Printed Circuit Board?).

I now have a 50-135mm that looks and functions like a new one.
Pentax charged 180 which includes postage, packing and VAT.

I think 180 was a fair price for this repair on what is a 900 lens new, service was quick, and it may be a help to anyone with a similar issue worried about the cost.
K-1, Sigma 12-24mm DG EX, Sigma 24-70mm DG EX, K-3, White K-01 with 40mm XS and white 35mm f2.4, SMC Pentax FA 1.8 31mm AL Limited, 43mm f1.9 Limited, 77mm f1.8 Limited, Sigma 17-50 f2.8, SMC Pentax DA* 50-135 f2.8, MX + SMC M 50mm f1.4, SMC A 50mm f1.4, SMC A 50mm f1.2, Spotmatic F 55mm f1.8, ES with 55mm f1.8 and 28mm f3.5, Program Plus (Chrome) with SMC A 50mm f1.7, Pentax 6x7, Leica ii, plus misc. odds and sods)

Gravelrash

Link Posted 28/10/2013 - 15:33
I was interested but never asked so the info is appreciated
Steve

Sometimes I'm serious and sometimes not, but I consider sarcasm an artform. Which is it today?

cabstar

Link Posted 28/10/2013 - 20:23
If you quoted Pentax user you would have got 20% of the price of repair if it was johnsons who repaired it
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sandinista

Link Posted 28/10/2013 - 20:30
That's good to hear Graham, thanks for the info. I have a very erratic 17-70 sdm lens and I might consider going down this route to get it repaired, it works just fine manually
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grahamcoad

Link Posted 28/10/2013 - 21:10
cabstar wrote:
If you quoted Pentax user you would have got 20% of the price of repair if it was johnsons who repaired it

It was, and I forgot...Please, no-one else make that mistake!
K-1, Sigma 12-24mm DG EX, Sigma 24-70mm DG EX, K-3, White K-01 with 40mm XS and white 35mm f2.4, SMC Pentax FA 1.8 31mm AL Limited, 43mm f1.9 Limited, 77mm f1.8 Limited, Sigma 17-50 f2.8, SMC Pentax DA* 50-135 f2.8, MX + SMC M 50mm f1.4, SMC A 50mm f1.4, SMC A 50mm f1.2, Spotmatic F 55mm f1.8, ES with 55mm f1.8 and 28mm f3.5, Program Plus (Chrome) with SMC A 50mm f1.7, Pentax 6x7, Leica ii, plus misc. odds and sods)

cgproudfoot

Link Posted 30/04/2014 - 18:23
Seems to be a common problem! Have just sent my DA*200 to Johnson's with the same problem - erratic and slow autofocus. Price 150 + VAT. Should get it back within 10 days. Hopefully the repair will last a while!
Chris

gtis

Link Posted 30/04/2014 - 18:43
Hi
I had a sdm failure on a da* 50-135 and sent it off to johnsons for repair
If you join pentax user plus at 10 per year as I did I got it repaired
For 144 including vat and return posted
cheers Neil
pentax k3 k5 super A da* 300 f4 da*50-135 f 2.8 smc 50mm f1.7 af 360 fgz pentax1.4xhd converter
Pentax o-gps1


Panasonic Dmc Fz200

cgproudfoot

Link Posted 30/04/2014 - 19:01
Thanks, Neil, but I've already paid, so I guess I'll need to remember when my next SDM fails
Chris

Mike-P

Link Posted 30/04/2014 - 19:13
cgproudfoot wrote:
Seems to be a common problem! Have just sent my DA*200 to Johnson's with the same problem - erratic and slow autofocus. Price 150 + VAT. Should get it back within 10 days. Hopefully the repair will last a while!

Unusual for any of the primes to have SDM problems, the 16-50mm and 50-135mm are the main culprits. My 16-50mm has had hesitant AF for years but has (so far) always sprung into life with a little coaxing.

It will probably die completely after me saying that, talk about tempting fate.
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grahamcoad

Link Posted 30/04/2014 - 19:37
If you drive an older vehicle, worth only...say 1000, but it needs 180 spent on it to last another few years, it seems sensible, and good value.

Strange then that people owning a 1000 lens baulk at paying 180 or so for the new updated SDM motor and sensor?

They should return the lens to 'as new' (or better) performance and last several years........
K-1, Sigma 12-24mm DG EX, Sigma 24-70mm DG EX, K-3, White K-01 with 40mm XS and white 35mm f2.4, SMC Pentax FA 1.8 31mm AL Limited, 43mm f1.9 Limited, 77mm f1.8 Limited, Sigma 17-50 f2.8, SMC Pentax DA* 50-135 f2.8, MX + SMC M 50mm f1.4, SMC A 50mm f1.4, SMC A 50mm f1.2, Spotmatic F 55mm f1.8, ES with 55mm f1.8 and 28mm f3.5, Program Plus (Chrome) with SMC A 50mm f1.7, Pentax 6x7, Leica ii, plus misc. odds and sods)

cabstar

Link Posted 30/04/2014 - 19:43
I've had a number of lenses and bodies repaired over the years and all have come back as good as new, bodies have had mirrors, sensors and focus screens cleaned lenses have all been cleaned out and recalibrated for prices not much more than a service.

DSLRs and lenses are so complicated now I don't think will it break more when..
PPG Wedding photography Flickr
Concert photography

Currently on a Pentax hiatus until an FF Pentax is released
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