Originally posted by brofkand I am definitely NOT against using manual-focus lenses. If the optics are pretty much the same as the newer AF variant, I don't see a problem in it. I don't shoot a lot of things where I require FAST focusing, so manual focusing is not a big deal. I use a few on my D40, but since the D40 can't meter with MF lenses I don't do it much. Just to clarify, Pentax cameras do support metering with manual focus lenses?
If a manual focus lens has an "A" on the aperture ring, it is capable of communicating with the camera just like any modern AF lens, so yes, the "A" lenses will easily meter on the K20. Older lenses without the "A" on the aperture ring (m42-screwmount, K series, and M series) will still meter, but it's a little trickier. On top of the camera next to the shutter button is a little green button that you push to meter with those lenses once you've manually set the aperture on the lens. Usually, the metering is pretty accurate if you're shooting with existing light, but in my experience, I haven't been able to figure out yet how to use these lenses with flash and get decent results.
Originally posted by brofkand As for the K10D vs K20D, here are my feelings on that: since I am switching systems, I would much rather go for a newer model. It may cost a bit more, but I don't want to start off with obsolete technology. The PC Sync is definitely a nice to have. Plus the 14MP CMOS which should be better than CCD in High-ISO situations (which I do a good bit). I am very big on portraiture and other fine-art work, so I think a fast 50 is more than enough to get started. Later on I'll buy a wide-angle zoom and a telephoto zoom.
Before getting my K20, I had a K10 and I've noticed a good bit of difference in noise levels at higher ISOs; while I don't do a whole lot of cropping, having the extra MPs gives me peace of mind for those times where I need to.
On the lenses, another good fast 50 to take a look at is the A50/1.7, which can be had for less than $100. Unless you need a constant 2.8, then I would recommend the DA55-300--for it's class, it's a sharp lens that produces great colors. In the same vein, I like the Sigma 17-70/2.8-4.5 because it packs a lot of utility in one lens--you get wide angle to portrait focal lengths, plus good closeup ability, along with overall good IQ.
HTH,
Heather