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11-21-2008, 08:13 AM   #1
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K10D won't accept Pentax-M 135mm prime lens

Help! I just purchased a Pentax-M 135mm 1:3.5 prime lens on ebay and I can't get it to work on either my K10D or K100D camera bodies. When I attach the lens to my K10D, I get a flashing "F-" and when I attach it to my K100D, I get a falshing "Av". Any idea what I need to do to get the lens to work?

11-21-2008, 08:17 AM   #2
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You need to enable the A setting in the custom menu.

I forgot exactly which custom menu it's under but it should be called "Allow A ring to be used" or something like that.

-Yale
11-21-2008, 08:36 AM   #3
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QuoteOriginally posted by jdpenk100d Quote
Help! I just purchased a Pentax-M 135mm 1:3.5 prime lens on ebay and I can't get it to work on either my K10D or K100D camera bodies. When I attach the lens to my K10D, I get a flashing "F-" and when I attach it to my K100D, I get a falshing "Av". Any idea what I need to do to get the lens to work?
I'd start by reading the owners manual.
11-21-2008, 08:56 AM   #4
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Yea you have to allow it to read the lens. Its in the custom menu and enables you to use the aperture ring. even after that you will see the "f--" and to meter you press the green button and it will give you a shutter speed. i keep it on M mode when i use these lenses.
double check the manual as well.

11-21-2008, 09:26 AM   #5
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THANKS GUYS! This solves my problem!
K10D menu --> Custom setting --> "using aperture ring" --> permitted
11-21-2008, 11:00 AM   #6
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This is on of the all-time most frequently asked questions here. There is a *great* thread on the ins and outs of using manual lenses:

K100D (Super) Pictorial guide to using manual lenses [imgs]: Pentax SLR Talk Forum: Digital Photography Review
11-21-2008, 12:09 PM   #7
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thanks, I'll check it out.
11-21-2008, 03:48 PM   #8
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You guys are quick, I knew that answer, hell I don't know many, but well pipped to the reply.

02-19-2009, 02:34 PM   #9
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can I use "Av" mode to shoot if i use pentax M series lens? Does the camera give a correct shuttle speed?

i do not often use "M" mode.

Thank you!
02-19-2009, 02:37 PM   #10
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QuoteOriginally posted by trna Quote
can I use "Av" mode to shoot if i use pentax M series lens? Does the camera give a correct shuttle speed?

i do not often use "M" mode.

Thank you!
Only if you shoot with the aperture wide open. For anything else you have to use "M" mode.
02-19-2009, 02:45 PM   #11
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thank you.

which means, i have to use f3.5 if i use Av mode?

since my K200D has green button, i will use "M" mode anyway.
02-19-2009, 05:42 PM   #12
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QuoteOriginally posted by trna Quote
thank you.

which means, i have to use f3.5 if i use Av mode?
Actually, regardless of what you do with aperture ring, the camera ignores it and shoots at f/3.5 anyhow when you shoot in Av mode. Which can sometimes be useful - in low light, that's probably what you would have done anyhow. But if you wish to use any other aperture, you need M mode. And indeed, the Green button (AE-L on models that lack a Green button) makes M mode a snap.
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