Quote:
Originally Posted by aokman
The 70-200 F2.8L IS is definately a nice lens i use it for most my photography and im planning on a teleconverter soon...if yours is dedicated for astronomy stuff though you might want to consider a 400mm prime F5.6 its a bit cheaper and id say it will be sharper than a L zoom lens with a 2 x converter 
But hey a 2 x teleconverter might not be that bad if your using a crop body |
Mine will be a general lens , not just for astroimaging.
Will be pretty handy on my 40D (which is "a cropbody").