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07-02-2011, 03:00 AM   #1
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K5 + da 18-135

Dear all,
Overall my feelings are very positive. Just on thing puzzles me.
I have tried a friend's K5 with a 18-50. The AF was very reactive with this characteristic "high-pitched" sound.
But, on my K5, with the DA 18-135, I feel the AF is slower with nearly no sound at all except a very small and quite "low-pitched" sound.
Is this normal ?
Best regards.

07-02-2011, 03:28 AM   #2
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The 18-135 lens is a DC lens w DC motor built in lens body, that's why it's very quiet when focusing. The DA1855 is making noise when focusing, so you'd feel it's faster. But actually the 18-135 is as fast if not faster.
07-02-2011, 03:34 AM   #3
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Thanks for your feedback ! I would say (but that's hard to measure) it takes around 0.75 seconds to focus from infinity to a very close object. Sounds OK to you ? Best.
07-02-2011, 04:32 AM   #4
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The 18-135 is one of Pentax's fastest-focusing lenses out there right now. It's only beaten by screwdrive lenses with very short throw, but it's up there!


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07-02-2011, 04:50 AM   #5
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Many Thanks Adam. This is why I want to be sure my lens is not defective and that what I describe is compatible with the standard behavior. Thanks.
07-02-2011, 04:55 AM   #6
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QuoteOriginally posted by aurelien_2010 Quote
Thanks for your feedback ! I would say (but that's hard to measure) it takes around 0.75 seconds to focus from infinity to a very close object. Sounds OK to you ? Best.
QuoteOriginally posted by aurelien_2010 Quote
Many Thanks Adam. This is why I want to be sure my lens is not defective and that what I describe is compatible with the standard behavior. Thanks.
That sounds normal to me.

And yes, the 18-135 is a very fast focusing lens in my experience
07-02-2011, 06:59 AM   #7
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That's the setup I have as well and the 18-135 is very quiet but does focus fast.
07-02-2011, 08:27 AM   #8
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The whole point is to estimate what fast means ! My first feeling was to find it quite low but this might just be my own feeling which is not correct...
Anyway I assume it either work or not and cannot be just "too slow". So I should assume it is ok, right ?


Last edited by aurelien_2010; 07-02-2011 at 09:28 AM.
07-02-2011, 10:10 AM   #9
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QuoteOriginally posted by aurelien_2010 Quote
The whole point is to estimate what fast means !
I understood what you meant, which is why before I posted my reply this morning I mounted my 18-135 to my K-5 and tried to get a feel for how fast it was going from end to end of the focus range. 0.75 seconds seems like a reasonable number, although as you said, it's not an easy measurement to estimate.
07-02-2011, 10:25 AM   #10
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OK so that's fine. Thanks again.
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