Originally posted by SteveB SteveB,
Thanks for bringing this subject up. I've mentioned it once or twice, but folks don't seem to think its related. Coupla days ago, i shot live indoor theatre dress rehearsals with 3 others, one had K20 like me, one had D7000 and the other D90.
A. Everytime i looked at the Nikon shooters, the focus assist lights were on for each shot, and its a WHITE light, not the GREEN light chosen for frequency purposes by the K5 engineers. (by the way, the K20 cameras we had did not use any assist light and we didn't seem to have any problem focusing - the lights weren't as dim as some previous plays)
I think this announcement usually doesn't get more attention because the D7000 owners most often talk about backfocusing, but not always. While the K5 owners talk about front focusing entirely. Perhaps thats due to the effect of the white focus assist light in low artificial light environments, i don't know.
What's similar is that the front focusing or back focusing is beyond the capability of the fine AF adjust tools, like -19 or more (on Nikon). Sure, cameras have long been subject to Tungsten focusing effects, whats different is the magnitude of the errors - i think - perhaps someone has a different perspective.
But the focus outrage among new owners seems to be an order of magnitude above the ordinary level of complaints on previous dslrs.
I can understand a bit why neither Nikon or Pentax want to talk on the record about this issue, auto focus issues are chronic, and many times due to inexperience of the operator. If i were in one of those companies (and i'm not), i'd be concerned that every customer would send in their cameras, instead of learning how to operate them in the first place.
But i don't doubt there is an issue here due to the several experienced shooters who have mentioned it on these forums. What we don't know is whether Nikon or Pentax can come up with firmware changes to mitigate the problems.
I'm still holding off buying a K5 because i don't know how much this issue would affect my shooting, which often is indoor and low light. But i don't often shoot at f2.8 and wouldn't need it to be particularly accurate below 6'. I wouldn't like it but could live with those limitations. the only way i'm going to figure out if its going to bother my shooting is just to go buy the K5. Both of us K20 owners were really impressed with the D7000 that our friend had. He was shooting routinely at 6400 and getting what appeared to be good shots while we were shooting at 2000 to 2500 iso. The D7000 owner did seem to be getting some highlight clipping which i've read some complaints about.