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10-26-2010, 02:45 AM   #1
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Need advise DA 300mm f/4 (IF) SDM Auto Focus!!!!!

I have just received my new DA 300mm f/4 (IF) SDM Lens for my K20D. After attaching it I have found the AF doesn't work. Have to focus manually. What do I need to do to get the AF to work. My software is 1.03 I noticed in the manual the K10 needs software 1.30 for the AF to work.

All the reviews I have read are good on this lens but nothing mentions AF not working all state good AF on K20D.

Can someone put me in the right direction.

Ta.

10-26-2010, 03:17 AM   #2
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You are correct that it should work with your camera and firmware.
I would be checking that the auto-focus switch is engaging correctly.
Mine makes a light click sound in each direction.

Also check that there is no plastic or packaging material stuck on any lens contacts.
Make sure the lens O-ring is correctly seated into it's groove.

Is the lens registering the correct aperture range?
Should be f4 to f32.
10-26-2010, 03:42 AM   #3
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You need both AF buttons (on camera and lens) set for the AF to work.

For clarity, with the K10 the AF will work with firmware prior to 1.3, but using the screwdrive.

v1.3 allows use of SDM autofocus.
10-26-2010, 04:15 AM   #4
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QuoteOriginally posted by Matthew Quote
You are correct that it should work with your camera and firmware.
I would be checking that the auto-focus switch is engaging correctly.
Mine makes a light click sound in each direction.

Also check that there is no plastic or packaging material stuck on any lens contacts.
Make sure the lens O-ring is correctly seated into it's groove.

Is the lens registering the correct aperture range?
Should be f4 to f32.




Thanks Matthew.

The auto-focus seems to be engaged it slides back and forth from AF- M both on lens and camera. Can adjust manually but on auto the shutter release button will just not move.

I also bought the DA 17-70SDM. and that works ok on Auto-Focus.

This is so disappointing was really looking forward to using it. I use manual most times but I do like to have the Auto-Focus working.

Any more suggestions? very frustrating I must say.

10-26-2010, 04:19 AM   #5
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Hi Peter,

I have put the AF on both the camera and lens but hasn't made any difference. On M on both camera & lens have not problems adjusting. Just AF on both camera & lens.
Have tried other lenses as well. no problem. Could it be a faulty lens. Had this sent out from B & H to Australia.
10-26-2010, 09:59 AM   #6
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I had the same problem with my K20D and the DA*300. It was shooting fine in AF one morning then all of a sudden it couldn't/wouldn't focus on anything. So I emailed Pentax about it and they told me to clean off the connectors on the body and the lens to see if that helped. Low and behold that fixed the problem. The connectors sure didn't look dirty but when I use the cleaner and cotton swab and cleaned them, the cotton swab came back as black as can be. So I did that a couple of times on each connector and like I said it works fine now. Hope this helps. I guess if it doesn't I would get in touch with B&H, they have great customer service and they can probably fix you right up.

Jim
10-27-2010, 03:37 AM   #7
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How do the contacts look?

QuoteOriginally posted by jbrowning Quote
they told me to clean off the connectors on the body and the lens to see if that helped. Low and behold that fixed the problem.
Agreed!

Do the lens contacts look the same as on your 17-70mm?
10-28-2010, 03:36 AM   #8
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QuoteOriginally posted by Matthew Quote
Agreed!

Do the lens contacts look the same as on your 17-70mm?
Checked this out and yes they do look the same also cleaned it.

Emailed B&H and instantly they advised me to return it. So have posted it back and will wait patiently for a replacement.

Thank you all for your advise and help.

Trish

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