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02-20-2008, 08:34 AM   #1
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SMC Pentax-A or M 50mm

Hi iv done a search but to no result. What i want to know is what is the diferance between the "SMC Pentax-M 50mm" and the "SMC Pentax-A 50mm"
Is it that the "A" version stops down automaticly or am i wrong?
Thanks for your help, i am just wanting to know before i buy.
Cheers Ross
EDIT: The lense will be mounted on a Pentax K100D Super

02-20-2008, 08:41 AM   #2
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02-20-2008, 08:57 AM   #3
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The A version will be little easier to use because it will meter automatically (without pressing AE-L), and you can control the aperture setting with the thumb wheel. Also matrix metering will be available with the A, but not with the M.

The M lens will stop down automatically when you shoot in manual mode, but it will not meter unless you press the AE-L.

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