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07-29-2012, 11:03 AM   #1
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Da* 50-135

I am a bit confused. I just got a new DA* 50-135 and I am having problems with it locking focus and also focusing in general. I am probably going to return it for a refund. I did get it to at least take some sharp pictures by adjusting the micro adjustment to +10 in my K5. What I do not understand is that in the reviews on this site several people have said that this lens focuses fast. What? This is probably the slowest focusing zoom lens I have ever used. Even without the problem I am having the zoom motor, although quiet, is extremely slow. Are there copies that focus faster than others?

07-29-2012, 11:15 AM   #2
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yes it is slow focus
for sports not good.
for general topic, it is fine..
07-29-2012, 11:21 AM   #3
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QuoteOriginally posted by liukaitc Quote
yes it is slow focus
for sports not good.
for general topic, it is fine..
For kids no good either. My little ones will not stay still enough for this lens to focus. What an expensive lens to use that you have to be really selective with.
07-29-2012, 11:24 AM   #4
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Quick shift

07-29-2012, 11:31 AM   #5
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QuoteOriginally posted by nicoprod Quote
Quick shift
Yes but it is a shame that you have to focus it yourself. I would be better off using manual focus on this copy.
07-29-2012, 11:41 AM   #6
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I have the same problem with my new lens I bought from B&H as you, backfocusing, had to adjust it to +10 to get sharp shots. Seems like this lens is plagued with either bad frontfocus or bad backfocus that needs a lot of fine tuning to get sharp shots.
07-29-2012, 11:49 AM   #7
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QuoteOriginally posted by djrocks66 Quote
Yes but it is a shame that you have to focus it yourself. I would be better off using manual focus on this copy.
I agree it's not a action lens, It's a portrait lens, great for wedding, photoshoot etc. but there's a price for the weather resistance, superior IQ, quiet focusing system and wide aperture. $900 is a fair price for this lens (warranty is a must though in case of SDM failure...). The sigma is much more expensive and not weather sealed. the Tamron is cheaper, loud and not weather sealed. Both are 70-200 and much heavier too.
07-29-2012, 11:49 AM   #8
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QuoteOriginally posted by LeDave Quote
I have the same problem with my new lens I bought from B&H as you, backfocusing, had to adjust it to +10 to get sharp shots. Seems like this lens is plagued with either bad frontfocus or bad backfocus that needs a lot of fine tuning to get sharp shots.
Does yours hunt back and forth a few times before it locks? Mine does that and doesn't lock. I have to recompose and sometimes it will lock. It is very frustrating.

Thanks

07-29-2012, 12:00 PM   #9
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QuoteOriginally posted by nicoprod Quote
I agree it's not a action lens, It's a portrait lens, great for wedding, photoshoot etc. but there's a price for the weather resistance, superior IQ, quiet focusing system and wide aperture. $900 is a fair price for this lens (warranty is a must though in case of SDM failure...). The sigma is much more expensive and not weather sealed. the Tamron is cheaper, loud and not weather sealed. Both are 70-200 and much heavier too.
I can handle the slow speed. It's the focus not locking that I have a problem with. This happens in good light as well as low.
07-29-2012, 12:28 PM   #10
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QuoteOriginally posted by djrocks66 Quote
I can handle the slow speed. It's the focus not locking that I have a problem with. This happens in good light as well as low.
then exchange and get a good copy.
07-29-2012, 01:05 PM   #11
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QuoteOriginally posted by liukaitc Quote
then exchange and get a good copy.
I just might. I am noticing what happens with this lens is that it wil try and focus and goes In and out about three times but does not lock the focus. If I stay at the same target and release and re press the shutter it will lock. This happens every time.
07-29-2012, 01:16 PM   #12
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QuoteOriginally posted by djrocks66 Quote
I just might. I am noticing what happens with this lens is that it wil try and focus and goes In and out about three times but does not lock the focus. If I stay at the same target and release and re press the shutter it will lock. This happens every time.
What body are you shooting with??
07-29-2012, 01:18 PM   #13
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QuoteOriginally posted by nicoprod Quote
What body are you shooting with??
A new K5
07-29-2012, 01:30 PM   #14
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So it doesn't lock the focus and stops at a random spot? Does the k-5 says it's focused (even though it's not)? This is a very strange problem... Does this new K-5 work fine with other AF lenses?
07-29-2012, 01:44 PM   #15
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QuoteOriginally posted by nicoprod Quote
So it doesn't lock the focus and stops at a random spot? Does the k-5 says it's focused (even though it's not)? This is a very strange problem... Does this new K-5 work fine with other AF lenses?
It doesn't lock the focus and they K5 focus lock light in the viewfinder flashes. If I let go of the shutter and press again it will lock. Then sometimes if i recompose it will lock but everytime I zoom to something it will do the focus in and out three times and not lock. I have the kit 18-55 WR and the 35 f2.4 and they both focus perfectly.

Thanks for your time
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