[alpalcargop]

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?

[lammie200]

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?

[alpalcargop]

thanks man, didnt even know you had to set that. was working fine before... anyways happy i can snap away again, cheers

[lammie200]

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.

[mtansley]

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.

[lammie200]

the Nikon will NOT allow you to meter with earlier manual Nikon mount lenses.

That is messed up.

[mtansley]

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.

[RioRico]

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.