Awagner wrote:
Your 75-300 lens should be fine for moon pics; just remember like previous posters have suggested- tripod is an absolute must and either a remote cable or timer on the camera to trigger the shutter. The key to these shots is exact focus and make sure your equipment is absolutely stationary and rock solid before you trip the shutter. If all that works well, you should have no problem cropping the pics and ending up with some awesome pictures.