Originally posted by little laker I wonder if that's just a Pentax thing.
I shoot my K-Mount 55mm f1.8, along with my screwmount 50mm f1.4 without a problem on my Sigma, but have problems focusing with my K100D.
OH, MAN!
I'm having the same problem with the same camera/lens combo!
I have a K100D, and recently bought a 55mm 1.8 K lens to use for portraits.
The lens has nice bokeh and color reproduction, but I've noticed that most of my images are just a bit soft, and that's not like me.
I was beginning to think there was something wrong with the lens, as this doesn't happen with any of my Pentax DA lenses. It's easier to focus my Lensbaby than it is the 55mm, and Lensbabies are not the easiest lens to focus!
The 55mm will focus accurately, but you have to make sure the focus is absolutely on the mark or you'll get a soft image. I usually have the lens set at f2.8 for the nice bokeh it gives at that aperture.
After reading this thread I don't feel so bad, as now I know it's not just my lens.
I think my solution to this will be to get a DA 70mm f2.4, since I've wanted this lens for sometime, and as previously mentioned, all my Pentax DA lenses focus very quickly and accurately.
As most of you know, if you take too long focusing on someone sitting for a portrait, you can lose the person's interest.
A very informative thread!
Mike
Last edited by Mike Bokeh; 08-18-2008 at 06:57 PM.
Reason: misspelled word