I'm new the world of old lenses, having only my kit lens on my K5 so far. A good start would be to get a fast 50, and most people agree that the F1.7 model is pretty great.
Would you recommend going with the Pentax-M or Pentax-A 50mm F1.7? From what I understand, the M model takes more work. You can only shoot in M, not AV - you have to manually stop down to meter with the green button, and manually set the aperture on the ring, whereas with the A you can just switch the aperture to A on the lens, use the aperture e-dial on the camera, and it meters like a normal lens. Is that right?
But I've also read that the A series has noticibly worse mechanical construction than the M series, with more plastic, crappier focus ring, etc. Is that true?
What about optically? Are they the same lens optically, or does one perform better than the other?
Can both lenses be used with the catch-in-focus mechanism on the K5?
Eventually when I have more money, I may end up getting the F or FA version of this lens too. Are those just as good as the older lenses in optics?
Last edited by SenorBeef; 05-06-2012 at 03:36 PM.