Hi Folks,
seems here are some K-7 users, so I have a question regarding focus:
I am quite happy with my K20D, except some focus issues. Sometimes, i.e. too often, the camera confirms focus but it is completley off. This is no bf/ff issue, just inconsitency of AF. The main problem seems to be that the AF Sensor (I only use center) is too big, so the camera finds contrast somewhere it is not supposed to. That the problem is more virulent the shorter the focal length seems to back this finding.
The other thing which confirms my thoughts is a comparison to Canon 50D which I got loaned from a friend along with 35 1.4 L lens. I compared to K20D with 31 Ltd. To my delight, this combo is not much better, only a little snappier and faster finding focus. But if the target is surrounded by other objects, i.e. the area I want to focus is thight, than the Canon is much more consistent albeit not perfect. And I know that on Olympus E3 you can choose between wide and narrow AF fields. So this is an issue which drives me nuts sometimes.
The other thing is tungsten light: the K20D has a problem with tungsten. I don't want to argue here, if you don't believe this, then fine. But I would appreciate info on wheter the K-7 solves this problem, from someone who has made the same observations. Because for this reason I can't use FA 50 1.4 in the studio with model lights. Luckily I don't have too many studio jobs. I also wonder how benjikan deals with this issue.
So, is the K-7 better AF wise? I am not interested in speed, but in accuracy and first and foremost in consitency and tungsten behaviour. I have most problems with 16-50, especially at about 20mm, but also with 31 Ltd. Otherwise I love these lenses so I would upgrade to K-7 just for consistent focus. Because, believe me, the K20D with 31 Ltd. gives more resolution than the Canon combo, with the same lovely bokeh, plus the K20D is much better regarding operation. Canon is just ignorant here. But that's another story ;-)
Thanks!
Last edited by ratjadi; 07-22-2009 at 12:58 PM.
Reason: forgot somehting