[jezza]

Does anyone know where I can find info on astrophotography for beginners?
I have a Canon20D attached prime focus (I think?) using an extension tube and 20mm eyepiece on a 5'' MAK. Have tried shooting moon, but only mange to get centre in focus. Rest is a blur.... Camera was set at 400iso 1/250sec exp
Must be doing something stupid, or is this what happens with the edges of eyepieces? Pardon my ignorance, but any advice or links to info appreciated.