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09-22-2011, 12:03 PM   #1
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prime lenses no longer working

since i started using the k-r i have been able to use my old prime lenses (smc 1:2.8 24mm, smc 1:1.4 50mm) with out any issues.

that is until recently. i now no longer have the option of choosing the focal length when i switch my camera on and none of the functions work with these two lenses.

i'm a beginner and therefore stumped. any ideas?

09-22-2011, 12:06 PM   #2
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Do you..?

QuoteOriginally posted by alpalcargop Quote
since i started using the k-r i have been able to use my old prime lenses (smc 1:2.8 24mm, smc 1:1.4 50mm) with out any issues.

that is until recently. i now no longer have the option of choosing the focal length when i switch my camera on and none of the functions work with these two lenses.

i'm a beginner and therefore stumped. any ideas?
Do you have the aperture ring enabled?
09-22-2011, 02:47 PM   #3
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thanks!

thanks man, didnt even know you had to set that. was working fine before... anyways happy i can snap away again, cheers
09-22-2011, 03:39 PM   #4
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One of many...

One of many things to remember along the way. Have fun.

I still think that it is way cool to get focus confirmation using manual focus lenses.

09-22-2011, 04:56 PM   #5
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QuoteOriginally posted by lammie200 Quote
I still think that it is way cool to get focus confirmation using manual focus lenses.
And shake reduction.

And being able to meter using ANY k-mount or M42 lens.

I shoot with a K20 and a Nikon D80 and the Nikon will NOT allow you to meter with earlier manual Nikon mount lenses.
09-22-2011, 04:59 PM   #6
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That's...

QuoteOriginally posted by mtansley Quote
the Nikon will NOT allow you to meter with earlier manual Nikon mount lenses.
That is messed up.
09-22-2011, 05:10 PM   #7
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QuoteOriginally posted by lammie200 Quote
That is messed up.
Agreed.

The Pentax cameras do allow the best backwards compatibility (AFAIK, can't speak for Olympus, Fuji, Canon, Sony and others.)

I believe some of the more expensive Nikons do allow metering but with Pentax, they ALL do I believe.
09-22-2011, 05:58 PM   #8
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Unlike much of the competition, ANY Pentax-compatible (and many non-compatible) lenses can be used on Pentax dSLRs. Unlike some of the competition, Pentax dSLRs can meter ANY lens used on them. For all except M-type lenses, ALL manual lenses will meter in Av or M mode. For stop-down metering with M-type lenses, use M mode and the Green button. (M-type lenses have an aperture-linkage flag but no mount contacts.)

I mentioned compatibility because it DOESN'T MATTER! I've chopped Nikon, Olympus, Exakta, and Contax-Yashica lenses to fit onto Pentax PK bayonet mount; they all meter. I've jammed all sorts of optical materials onto bellows and tubes; they all meter. Reverse a lens; it meters. Break a lens; as long as it's in front of the mount, it meters. Oh yeah, and SR works on all of those too.

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