Originally posted by Adam The AF is pretty good- I don't have any complaints except one: for action photography or sports, it would be nice to have more AF points and faster AF speed, though. In low-light, (without the assist lamp) the AF is still lacking (hunts more) compared to that of Canikon, but it's definitely better than it was in older bodies.
Thanks for your response. I'd be coming from a Nikon D90, which is just about good enough for the small amount of action photography that I do, and its AF also does pretty well in low light. If the K-5's AF is as good or better, it would probably meet my needs, although the faster
and the more accurate, the better. I do sometimes photograph puppies for a couple of animal rescue operations, and quicker AF would help a lot with that.
My plan is to commit to a single interchangeable lens system and to sell my DSLRs and lenses from other systems. I am leaning towards Pentax or Nikon. In either case, I'd be buying a K-5 or upgrading to a D7000 for their better sensors. I also have an Olympus DSLR, but Olympus seems to have abandoned FT, and their sensors have not kept up. (If the only consideration was lenses, I'd pick FT.)
Between the D7000 and the K-5, AF data is ambiguous. Clearly, the D7000 has a more sophisticated AF system, but is it "better"? There have been many reports of inaccurate D7000 AF, and Chasseur d'Images downgraded the camera partly for that reason. There was also the recent test in a German magazine reported here that found the K-5's AF to be the most accurate among DSLRs. The French store FNAC's test of AF-C showed the K-5 to be about as good as the D7000. OTOH, Pop Photo reported a drop in the K-5's AF speed at lower light levels, and the K-5's tungsten low-light problem does not seem to have been solved.
Other than AF, my biggest concern about committing to Pentax is uncertainty about the direction that Ricoh will take. They paid a fire-sale price for the Pentax camera division, which is not a good sign. Only time will tell if they are committed to future DSLR development.
Jeff