2.2m-telescope on Calar Alto

 

 

 

 

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)