I just acquired a Pentax-A 50mm f/1.7 lens. All exposure modes are supported on my Pentax DSLR as well as matrix metering and P-TTL flash. Everything except auto-focus. Although I would have liked a f/1.4 I decided paying at any where from $60 to $400 more for 1/2 a stop of speed wasn't worth it. If I needed 1/2 a stop more just change the ISO. It's not like the film era where I would have to push/pull the processing to manipulate the ISO.
Just a walk around the block for some quick snaps (uncropped, no post processing unless noted):
Slightly out of focus
I tweaked the levels slightly to reduce the minor blowout in the background
Shot in shade, you can see the tongue doing the Chuck Jones road runner thing.:
It's nice to be able to shoot at ISO 100. I miss Kodachrome 25.
Edit: some quick and dirt post processing, cropping, white balance, levels