Introduction

Pupil plane is set by AT M2. The specifications for the AT foci are shown in Table 23.1. The distances of the AT mirrors along the optical axis are given in Table 23.1.

Focus	f-ratio	focal length	image scale	Field of view
		($\mbox{m}$)	( $\mu \mbox{m arcsec}^{-1}$)	($\mbox{arcmin}$)	($\mbox{mm}$)
Nasmyth	25.0	45.0	218	8	104.6
Coudé	36.2	65.2	316	2	37.8

Mirror	Distance from	Physical distance	Reimaged distance
Mirror	last mirror	from M1 along axis	from M2
	($\mbox{mm}$)	($\mbox{mm}$)	($\mbox{mm}$)
M1	0.0	0.0	$32586$
M2	2493.4	2493.4	$0$
M3	1793.4	4286.8	$\sim 1182300$
M4	1450.0	5736.8	Near image plane
M5	1630.0	7366.8
M6	950.0	8316.8
M7	4400.0	12716.8
M8	1344.6	14061.4
M91	2470.2	16531.6