97/08/27  mars tail observation

singlet, f=41

file	expo.	filter
m000	10s	5050
m001	100s	"
m002	5min	"
m003	5min	5200
m004	10min	5050
m005	10min	5200
mars2	5sec	5200		without OD
mars3	 "	only dichro
m006	10min	  "
m007	 "	  "		increase coverage of OD
m008	 "	5050
m009	 "	5200 		set
od	1min	 "		occulting disk image
>> darks <<
drk1s
drk5s
drk10s
drk100s
drk1m
drk5m
drk10m

flt1	1min	5050		dome flat
flt2	 "	5200		"
flt3	1sec	only dichro	"

s_center			Saturn at center of FOV
s_north				  "  , telescope moved to N-direction


* Singlet lens cause significant color aberration in the case of no band-pass
filters. It may produce the Mars image 'inside' the occulting disk.
Doublet lens reduces this effect much.

Best focus determined by the Moon, no band path only dichroic

Singlet:	f=21,	d_lam=200.7	not in focus
doublet:	f=0,	d_lam=257.8	sharp