Calar Alto Telescopes at a Glance
3.5m:
Prime focus with 2 lens corrector:
f/3.5, focal length = 12.195 m
1" = 59 micron, 1 mm = 16.9", FOV: 28.2 arcmin = 100 mm
CCD scales for imaging: TEK 24 micron = 0.41"
TV guider: off axis field 4.6' x 3.4', V(limit) ~ 20mag
Prime focus with 3 lens corrector:
f/3.93, focal length = 13.761 m
1" = 66.7 micron, 1 mm = 15", FOV: 60.7 arcmin = 243 mm
RC (Cassegrain) focus:
f/10, focal length = 35.000 m
1" = 170 micron, 1 mm = 5.9", FOV: 29.5 arcmin = 300 mm
TV guider:
- on and off axis field, f/10: 5.2' x 3.9', V(limit) ~ 19.5mag
- on and off axis field, f/45: 1.1' x 0.9'
- instrument view (TWIN): 4.5' x 3.3', V(limit) ~ 18.5mag
- instrument view (Spaltspinne, FOCES): 2.9' x 2.2'
2.2m:
RC (Cassegrain) focus:
f/8, focal length = 17.610 m
1" = 85.4 micron, 1 mm = 11.7", FOV (w/o corrector lens):
33 arcmin = 170 mm , FOV (with corrector lens): 67 arcmin = 345 mm
CCD scales for imaging: RCA 15 micron = 0.176", TEK 24 micron = 0.28"
TV guider:
- on and off axis field: 2.8' x 2.1' arcmin, V(limit) ~ 19.0mag
- instrument view: 4.5' x 3.4' arcmin, V(limit) ~ 19.5mag
Coudé focus:
f/40, focal length = 88.000 m
1" = 435 micron, 1 mm = 2.3", FOV: 5arcmin = 128 mm
1.23m:
RC (Cassegrain) focus:
f/8, focal length = 9.857 m
1" = 47.8 micron, 1 mm = 20.9", FOV (w/o corrector lens):
15 arcmin = 43 mm , FOV (with corrector lens): 90 arcmin = 258 mm
TV guider:
- on axis field: 5.0' x 3.8', V(limit) ~ 18.5mag
- off axis field: 5.0' x 3.8', V(limit) ~ 18.5mag (moveable)
Schmidt Telescope:
f/3, focal length = 2.40 m
1" = 11.6 micron, 1mm = 85.9", FOV: 8 deg = 335 mm
Two objective prisms 590 and 1390 A/mm at 430 nm
Another 1.5m telescope is operated under the control of the
Observatory of Madrid