I have been experimenting with Live View of my camera (Nikon D5100) to get a feel for what a mirrorless camera would be like, and also because I am wanting to shoot video clips of distant moving objects such as planes and birds. I realize that video on this camera is really not ideal, but at the moment it's the only thing I have with the level of zoom required to get close enough to such objects.
But in doing so I have noticed that I find it almost impossible to actually use live view for either planes or (especially) birds, because I can't actually get the camera aimed the right direction for them to show up. With a plane it's a bit easier as it's not moving as fast relative to me, so I can quickly locate it through the lens, then switch to live move. It's still a bit tricky, and in the process of moving the lens away from my eye the camera still moves and I can lose the aircraft I'm trying to track. For moving birds it has proved impossible - I can get off a few shots through the lens, but if I try to live view instead by the time I have live view on the bird is gone. Trying to hunt for either object directly in live view without first looking through the viewfinder seems too time consuming.
At first I thought maybe it was the size or brightness of the display, but I turned the brightness to maximum and it didn't help, and I am not sure how a bigger display would help me point the camera in the right direction.
Is using live view or correspondingly a mirrorless camera suitable for telephotos shots of moving subjects? I am wondering if there is some trick doing this or if maybe it's just me. My on-axis hand-eye coordination seems to be great - I have never had any problem photographing moving subjects through the lens; but off axis (not looking through the lens), will it improve with lots of practice or am I just wasting my time?