3.5m-telescope on Calar Alto

 


 

* 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

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)