http://www.space.com/scienceastronom...lescope_I.html
that might help youu narrow it down, i would assume taking a telescope shot would work the same as taking a shot thru a microscope with the maco function...in other wprds yes i think it can be done without special adapters....but i have never tried with a telescope. only microscope. i would buy a tele from a reputable lensmaker...zeiss ...etc