Socco
Best you read these couple of threads:-
http://www.iceinspace.com.au/forum/s...ad.php?t=34114
http://www.iceinspace.com.au/forum/s...ad.php?t=27116
The problem you will face is that the primary mirror is probably a spherical mirror and the extra lens corrects for its abberations. With it removed, it may not perform well at all
Eric