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 aperture
mm
800
focal length
mm
2400
f/ratio  
1/3
FOV
°
8
 
mm
335
plate format
inch
8 x 10
scale
"/mm
86.2

 

Two objective prisms with 590 and 1390 Å/mm at 430 nm

 

 

Image of Schmidt-telescope (154 kByte)

CAHA-T35 CAHA-T22
CAHA-T123 CAHA-Schmidt

 

3.5m Telescope 2.2m Telescope 1.23m Telescope Schmidt Telescope

 

* undersized secondary

 

 corrector
prime-system
RC-system

 IR-system

 2 lens
3 lens
aperture
mm
3 500
focal length
mm
12 195
13 761
35 000
 157 500
central obscuration
mm ø
820
1367
 281.66
eff. coll. area
m²
9.093
8.153
 8.969*
f/ratio  
1/3.48
1/3.93
1/10.0
 1/45
FOV
mm
100
243
300
 109
 
arcmin 
28.19
60.71
29.47
 2.38
scale
"/mm
16.9
15.0
5.89
 1.31
radius of field curvature
mm
infinite
-3786
  
hourangle range
 h
-7 to +7

 

 

Image of the 3.5m-telescope (399 kByte)

Cut through 3.5m-building (17 kByte)

 
RC focus
Coudé focus
 with
without
Corrector
aperture
mm
2200
focal length
mm
17 037
17 611
88 000
central obscuration
mm ø
1046
887
656
eff. coll. area
m²
2.942
3.183
3.463
f/ratio  
1/7.744
1/8.005
 1/40
back focal distance
mm
1216
1216.5
 14 100
focal range
mm
240
240
5 000
FOV
 arcmin
67
33
 5
 
mm
332
170
128
scale
"/mm
12.1
11.7
 2.34
radius of field curvature
mm
infinite
-2228
  
hourangle range
 h min
 -16:40 to +16:40

 

 

Image of 2.2m-telescope (401 kByte)

Cut through 2.2m-building (20 kByte)

 

 
 with
without
Corrector
Aperture 
mm
1230
Focal length
mm
9807.6
9857.1
Central obscuration
mm ø
582
Eff. coll. area
m²
0.922
f/ratio  
1/8
Back focal distance
mm
852.1
849.9
Focal range
mm
± 200
FOV
arcmin
90.2
90.0
 
 mm
257.2
258.1

 Aberration free
arcmin
  
 15
 
mm
  
43.0
Scale
"/mm
20.9
Hourangle range
 h min
 -15:06 to +14:50





Corrector Details
&nbsp Lens 1 Lens 2
Diameter 290 mm 280 mm
Aperture 276 mm 258 mm
Shape convex concave, spherical biconcave, spherical
Center thickness 25.1 mm 24.4 mm
Surface antireflective coating on both sides, reflection minimum at 550 nm antireflective coating on both sides, reflection minimum at 550 nm
Material Quartz glass Quartz glass




 

Image of 1.23m-telescope (354 kByte)

 aperture
mm
800
focal length
mm
2400
f/ratio  
1/3
FOV
°
8
 
mm
335
plate format
inch
8 x 10
scale
"/mm
86.2

 

Two objective prisms with 590 and 1390 Å/mm at 430 nm

 

 

Image of Schmidt-telescope (154 kByte)

 

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