k5083 wrote:
As for exposure, you might get better results if you meter on a ground target and lock the camera manually into those settings. Otherwise, light from the surrounding sky can trick your camera into underexposing the planes, as may have happened in your 4th pic.
You may also be having focus issues. Remember that autofocus is a convenience, it is not an improvement over manual focusing. You can often get sharper pics if you focus manually.
As others have said, shooting at low speed to get prop blur, especially without image stabilization, guarantees a limited success rate even if you're quite practiced. When I am shooting a plane that I really want to nail and I'm only going to get one or two passes, I back off to 1/500. I am not so hung up on the fashionable fetish of prop blur that I am willing to risk not getting any sharp shots of a plane I really want. Once I am sure that I have nailed a few good shots, I'll go to 1/250 or even 1/125 and try for blur. If you can't live with a lot of rejects, get a stablized lens or don't go there.
August
Yes. I am lucky that my lens has Vibration Reduction. So I have that step down.
Also it seems my photos are compressed when I post them on a forum-losing clearness. Darn!
Generally if I am going to crop a picture what is best to do that? I have tried cropping but it makes the photo pixelly and fuzz?

I do have Photoshop Elements and photo studio 5.5.
Still learning.... Thanks for the help!

I use my hotmail skydrive to post my pictures and then you can post them on here via the img HTML link they provide for each picture. They come out clear as a bell for my photos.
Flickr and photobucket, always seem to mess mine up for some reason, anyone else have compression issues?