D50 seemed to do a good job. What lens/apperature/Af-s,af-c,af-a?/ Basically if you can post some exif that would be nice. Seems your focal point is off slightly and your apperature may be too far opened. What lens are you using btw?
I was using a 70-210 d with a haze filter. I shot in shutter priority at 1/500 which put the aperature between f11 and f13, af-c, exposure compensation at -.3. All of these were shot with the lens almost all the way out at 210. I know the focal point is off a little bit. For some reason, the camera kept switching the focal area to the right side of the frame with that lens. I tried it later in the day just messing around, and it stayed in the center, so I must have been doing something wrong.