I am looking into purchasing a ball head for my tripod and , through surfing, I found that most of the good heads require a separate "custom" camera plate to mount on the ball head. My D7000 seems to be OK. My F4 is not. AcraTech doesn't have one for it, but have one for just about every OTHER Nikon from F2 forward. Same with Kirk. The Real Right Stuff folks have one, but it's for the F4S ( bigger battery holder version ) and not the F4. What's the issue ? I would have thought F4 owners would be more likely to need a camera plate than the lighter bodies.