In reply to Denni:
For the moon at quarter like it is now, put your camera to manual and try the following exposure: F4, ISO100, 1/250 sec.
Double exposure time for every stop slower (eg F5.6) (half for faster eg F2.8)
Half the exposure time for every doubling of ISO.
This'll get you close, experiment for best results. It's surprising what a short exposure is needed. This is independent of focal length.
Can handhold upto about 200mm at this time (perhaps go to ISO200), which is about the shortest focal length worth bothering with to get a picture of just the moon.
1500mm will more or less fill the frame of a crop sensor DSLR.