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01-24-2009, 09:29 AM   #1
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Join Date: Jan 2008
Location: Sipoo, Finland
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SMC Pentax-M 50mm and K10D

Hello for everybody. I'am new with these things and I get that old lens and I like to use it with my K10D. Only problem is, that I can take pictures only with full aperture, which is 1:1.7.

I wonder, that is it possible to set up things so, that i can use hole scale of aperture? It will be quite usefull sometimes. There is no matter, even I turn aperture ring to 22, images will allways be taken by full aperture.

-Olli-

01-24-2009, 09:51 AM   #2
mer
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Join Date: Nov 2007
Location: Greece
Posts: 237
Your SMC-M 50mm F/1.7 is a full manual lens ( no electronic connections between the body and the lens ) . Although the lens will work in aperture priority mode ( Av ) it will ONLY work wide open . If you want to shoot with other apertures you have to set it to Manual mode , stop down to meter then take a pic .

have fun
01-24-2009, 10:16 AM   #3
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Original Poster
I have noticed, that in M mode with green button camera test the aperture, so I can use this lens on my purposes as planned, with other aperture than wide open. Thank you for your help!
01-24-2009, 10:58 AM   #4
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Marc Sabatella's Avatar

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Location: Denver, CO
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The Green button will stop down quickly, take a reading, and set shutter speed for you.

The DOF Preview will stop down for as long you keep the preview open, and show you a "live" meter reading, that updates as you change shutter speed and aperture.

Both methods are quite useful.

01-24-2009, 01:32 PM   #5
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it's actually a shame that you can't program the green button to just show the metering and not change it
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