Mon 17-Sep-12 12:13 AM | edited Mon 17-Sep-12 12:15 AM by glo
Please post a photo showing the “blurred and dark and with little detail”. Also, this photo needs to have the EXIF intact. Then I think you will receive some good information as to what may be the problem.
I shoot a D300 and 80-400VR. As has been stated, this lens can be pretty difficult to focus on a BIF. Try the following settings and see if they help with BIF against the sky.
Keep Shutter Speed as high as you can. At least 1/1000. Set the Shutter release to CH Mode shooting speed. Set the AF-Area Mode selector on Auto-Area AF (User Manual pg 64) Set Focus Mode on Continuous-serve AF (User Manual pg 62) Set Custom Settings Menu - a1: AF-C Priority Selection to Focus (User Manual pg 267) Set the Focus Limit Switch on the lens.
The User Manual page numbers are for D300, so they may be different than the D300s.