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01-18-2015, 08:18 PM   #1
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Pentax K-30: Have a prime & kit lens - Looking for upgrade

I have been using my K-30 mostly with my prime lens - Pentax SMC DA 50mm f/1.8. We took great pics in Hawaii with this one. I loved the lens so much that I hardly ever used my kit lens 18-55mm. We now have a baby and he is restless and with 50mm 1.8 auto focus so noisy he gets distracted and if I use manual focus he is crawling to grab the camera. We are looking to buy a lens so that he doesn't get distracted with auto focus but still manage to take pics as sharp as prime(even in low light). Kindly suggest.

01-18-2015, 08:25 PM   #2
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What is your budget?

At the higher end, here are two silent focus lenses with great quality, focal length similar to your prime and kit.

Pentax SMCP-DA 17-70mm f/4 SDM
Pentax DA* 55mm f/1.4 SDM

Last edited by Imp; 01-18-2015 at 08:31 PM.
01-18-2015, 08:34 PM   #3
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What about the DA*16-50 2.8 ?
01-18-2015, 08:36 PM   #4
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QuoteOriginally posted by nonstopnick Quote
What about the DA*16-50 2.8 ?
More quality issues. If pingu is happy with shooting primes, it seems the DA* 55mm would work better.

01-18-2015, 09:02 PM   #5
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I'd suggest the DA 35mm f2.4 but maybe that one won't be quiet enough.
01-18-2015, 09:19 PM   #6
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QuoteOriginally posted by Imp Quote
More quality issues. If pingu is happy with shooting primes, it seems the DA* 55mm would work better.
??? You also listed the 17-70 which has a rough reputation due to sdm failures but also is not generally thought to be as nice in terms of IQ as the DA* 16-50.
01-18-2015, 09:26 PM   #7
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QuoteOriginally posted by UncleVanya Quote
??? You also listed the 17-70 which has a rough reputation due to sdm failures but also is not generally thought to be as nice in terms of IQ as the DA* 16-50.
True. I meant 55 vs. 16-55, if you were getting one or the other. But since the 17-70 is similar priced to the DA*s, I guess either DA* is better
01-18-2015, 10:05 PM   #8
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QuoteOriginally posted by UncleVanya Quote
??? You also listed the 17-70 which has a rough reputation due to sdm failures but also is not generally thought to be as nice in terms of IQ as the DA* 16-50.
A DA*16-50 has a far worse reputation when it comes to SDM failures than the DA17-70. Further the 17-70 is a lot cheaper than a 16-50, so comparing IQ is not quite fair; I know, you get what you pay for.

01-18-2015, 10:29 PM   #9
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QuoteOriginally posted by sterretje Quote
A DA*16-50 has a far worse reputation when it comes to SDM failures than the DA17-70. Further the 17-70 is a lot cheaper than a 16-50, so comparing IQ is not quite fair; I know, you get what you pay for.
The DA*16-50 with its combination of focal range and it's 2.8 appiture would seem to be a better fit for what the OP was considering than the 17-70. I assumed the SDM issue was a solved problem.
01-18-2015, 10:33 PM   #10
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Sigma 35mm 1.4 Art or any other Sigma lens with silent motor... They motors are reliable.
01-18-2015, 10:46 PM   #11
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QuoteOriginally posted by sterretje Quote
A DA*16-50 has a far worse reputation when it comes to SDM failures than the DA17-70. Further the 17-70 is a lot cheaper than a 16-50, so comparing IQ is not quite fair; I know, you get what you pay for.
Source? The data I had seen seemed to suggest otherwise and the Pentax reps I know steer people away from 17-70 to 16-50, but they don't quote statistics.
01-18-2015, 11:01 PM - 1 Like   #12
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QuoteOriginally posted by UncleVanya Quote
??? You also listed the 17-70 which has a rough reputation due to sdm failures but also is not generally thought to be as nice in terms of IQ as the DA* 16-50.
QuoteOriginally posted by sterretje Quote
A DA*16-50 has a far worse reputation when it comes to SDM failures than the DA17-70. Further the 17-70 is a lot cheaper than a 16-50, so comparing IQ is not quite fair; I know, you get what you pay for.
QuoteOriginally posted by UncleVanya Quote
Source? The data I had seen seemed to suggest otherwise and the Pentax reps I know steer people away from 17-70 to 16-50, but they don't quote statistics.

much of a muchness between them based on the survey posted a while ago. (2012)

Pentax SDM Failure Survey Results - Articles and Tips | PentaxForums.com
01-18-2015, 11:12 PM   #13
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QuoteOriginally posted by Chaos_Realm Quote
much of a muchness between them based on the survey posted a while ago. (2012)

Pentax SDM Failure Survey Results - Articles and Tips | PentaxForums.com
Thanks! That is different from what I remembered.
01-18-2015, 11:24 PM   #14
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But I'd suggest a DA* 50-135, if you want to have enough distance so he won't notice you shooting. If budget allows, and it has a great IQ as I heard. and you'll have a lens in the range you don't have anything!
01-19-2015, 12:09 AM   #15
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Thanks for the inputs. I was inclined to Pentax DA* 50-135mm & Pentax 17-70mm as I could shoot from distance with the former and AF seemed to be fine in either of them, but SDM failures and related reviews made me nervous.

As for price I am looking at max US $500 - Plus I can wait and save 200-300 more if reqd
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