SDM Lens on K100D

[katman]

I Know K100D does not support SDM but what will happen if you actually use
the SDM lens on a K100D.

Any alternative f/2.8 lens that can is good for macro also

[billitone]

I think the SDM lens will be working with K100D, only that the SDM will not work (it will not focus faster and quietly).

[istDeS]

The new SDM DA* lenses still has the slotted drive screw, so you can still use it on a K100D like any other pentax auto focus lenses. Only the SDM will not function as K100D do not have electrical contacts to drive the SDM lens.

For macro lens with f/2.8 aperture, you can consider.

DFA 50mm f/2.8 macro
DFA 100mm f/2.8 macro
Tamron 90mm f/2.8 macro

or the Voigtlander APO Lanthar 125mm f/2.5 Macro

[fengwei]

Originally Posted by billitone I think the SDM lens will be working with K100D, only that the SDM will not work (it will not focus faster and quietly).

Based on some tests done by some Taiwan Pentax users, the new DA* lenses focus faster and quieter than the DA16-45 even on Ds And still, you can take the advantage of the weather sealed body, F2.8 constant aperture, better built quality ... Still worth it I think.