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09-20-2011, 07:01 AM   #1
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pentax 55-300 da l no longer manual focuses

I just tried my lens on my k100d and it doesnt manual focus anymore. When i put it on mf it still auto focuses, when i try to turn it, its like turning it on af. My 18-55 works fine. Funny thing is i just used this lens a month ago at a airshow. Any ideas? should i get a new lens, i need the manual focus cause i shoot a lot of airshows

09-20-2011, 07:17 AM   #2
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I believe this thread is related to your problem. Seems to happen in rare instances. A trip to the service center will correct it. Perhaps someone here has a DIY solution, but I believe this to be an electrical malfunction of the AF-MF switch. Good Luck.
09-20-2011, 07:36 AM   #3
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i read that post, but my 18-55 works fine. Its just when the 55-300 is attached. I have a airshow on sep 30 and wanna know what i have to replace
09-20-2011, 09:00 AM   #4
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QuoteOriginally posted by boomer82 Quote
i read that post, but my 18-55 works fine. Its just when the 55-300 is attached. I have a airshow on sep 30 and wanna know what i have to replace
If it's just the one lens, then perhaps the 55-300 is not being mated properly to your body. Clean the electrical contacts on both the camera and the affected lens with appropriate solution, and try again. This is about all the troubleshooting I can think of.

09-20-2011, 09:15 AM   #5
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QuoteOriginally posted by boomer82 Quote
i read that post, but my 18-55 works fine. Its just when the 55-300 is attached. I have a airshow on sep 30 and wanna know what i have to replace
Since you have K100D, I will assume you have 18-55 first version. DA 18-55 will manual focus regardless of AF / MF setting as that's how it's designed ("quick shift").

DA L 55-300 doesn't have quick shift. Using 55-300 DA L, if it feels like the body is on AF when the switch is on MF, that means there's a problem with the body, as the AF screw should have retracted back to the body when the body is set on MF, allowing focus ring to be turned.

On the bottom left picture, check if screw #7 moves in and out of the body when you flick the af / mf switch.It should move out towards the lens when on AF.
http://www.aohc.it/images/k1e.gif

Last edited by Andi Lo; 09-20-2011 at 09:20 AM.
09-20-2011, 09:25 AM   #6
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Good call Andi, he had convinced me it was just the one lens, but I did not think of this possibility. Boomer, Andi is right on the money here... if you have the DA L version of the 55-300mm I think you have a camera body function as I linked to in post #2.

Andi: Good to see a maritimer here... I'm in Fredericton NB.
09-20-2011, 09:35 AM   #7
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just checked, it doesnt move, only when i click the lens release button, nothing with af/mf switch. So its the body then? Is there an easy fix?
09-20-2011, 09:38 AM   #8
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I'm sorry boomer, I have no knowledge of a fix other than to send it in for repair. I know that's not what you want to hear.

09-20-2011, 07:18 PM   #9
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@boomer: just for the airshow, you can set the body to MF and keep pressing the lens release. The camera will still shoot the picture. After that you can send it for repair (or heck, just buy another k100).

@firefly: haven't been to fredricton, the atlantic canada group need to do a gathering sometime
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