nos832, nos833			beam goes down. No TTM. 
av83				trying to see a scheme for f/ratio=52
av831, av832			f/ratio = 53; complete scheme
avs832				only FP for spectrograph
avs83				Off-axis parabola and FP for spectrograph.
decenter831			decentered mirrors
som83				f/ratio = 82.5 Only spectrograph FP
bom83				a modification of the main scheme (aom83)
aom83 				base-design
ttm833				base-design for TTM with zoom lens
ttm833s				a steering mirror is included
wfs835				f/ratio = 90.3; Bad Image
ttm831				f/ratio = 20 two lenses and steering mirror
ttm832				f/ratio = 25.47 
ttm835				f/ratio = 181.2; 2.28 mm for 5 arc sec
wfs834				base; f# = 179.4; a lens after lenslet; 2.8 mm/5 arc sec