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04-11-2008, 06:48 AM   #1
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HELP! manual lens problems with K10d

I purchased two sears prime lenses. One 50mm f1.7 and a 135mm f2.8. BOth are fully manual. When I mount the lens on my K10d, the aperture opens all the way and stays there. Is there something that I can do to remedy this? I can't use the ring to change the aperture. The lenses also do not have the green "A' on them. Any help is appreciated.

Jeff

04-11-2008, 06:51 AM   #2
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I think you have to set the "Aperture ring in other than A" setting to YES.
04-11-2008, 06:52 AM   #3
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i have exactly the same issue with my pentax 50mm f1.7 and would love to know the anser to this (i dont want it stuck on f1.7 all the time)
04-11-2008, 06:53 AM   #4
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QuoteOriginally posted by pentagor Quote
I think you have to set the "Aperture ring in other than A" setting to YES.
where can i find this setting please?

04-11-2008, 06:53 AM   #5
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check out that link for K100D instructions, there is a setting in the menus to enable Aperture control. but for K10D should be similar, but metering is done pressing the Green Button instead

K100D (Super) Pictorial guide to using manual lenses [imgs] [Page 1]: Pentax SLR Talk Forum: Digital Photography Review
04-11-2008, 06:59 AM   #6
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And something else: If you are looking at the aperture from front when mounted, it will be always wide open. Why? Because you are focusing always wide open. When you press the shutter, the camera stop down the lens to the aperture set with the aperture ring. So you will not see the aperture closing when mounted on the camera. The exception are M42 lenses, while the camera cannot control them.
04-11-2008, 07:00 AM   #7
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yey!

its kinda working now

i'm using the green button for the metering and then when i press the shutter button it stops down to the actual f-stop with a damn fine clunk.

the DOF preview button works now too.

thanks for your help people

EDIT: so from my guesswork we have to use manual mode all the time unless we want to use the widest aperture in which case we can get away with Av mode.
04-11-2008, 07:05 AM   #8
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And BTW: Welcome! ;-)

04-11-2008, 07:06 AM   #9
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I don't have the "A" setting. It stays at f1.7. I tested this by taking the same shot at f1.7 and f16. the camera selects the same shutter speed for both. DOF is no different on the image.
04-11-2008, 07:08 AM   #10
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QuoteOriginally posted by jster91 Quote
I don't have the "A" setting. It stays at f1.7. I tested this by taking the same shot at f1.7 and f16. the camera selects the same shutter speed for both. DOF is no different on the image.
Which mode are you using? M?
04-11-2008, 07:08 AM   #11
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Ok. Figured it out. Aperture priority only uses max aperture. Manual mode stops down just as stated above. Thanks for the help. Whew!
04-11-2008, 07:09 AM   #12
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QuoteOriginally posted by pentagor Quote
And BTW: Welcome! ;-)
lol thanks, i followed jster here.

looks like a good place though! gonna have to stick around i think
04-11-2008, 07:10 AM   #13
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Of course. You cannot use the metering in Av mode, because the lens is wide open all the time. You can use it with the M42 lenses though.
04-14-2008, 03:41 PM   #14
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You can also use Av mode when stopped down a bit, as long as you use the appropriate amount of EV compensation. For instance, I have a Sears K-Mount 135mm f/2.8 lens. If I want to use Av with an aperture of f/4, I just have to set the EV compensation to overexpose by one stop.
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