Optical Database

INT-Main optics

Authors: M.F.Blanken

Revision 0.1 04/10/00

Revision History

0.1 First draft

Filename: \\Ormnt1\Group_Area\Optics\Master_Documents\INTMain.doc

Owner: M.F.Blanken

Content:

Optical specifications    *

Mechanical specifications          *

Cleaning           *

Measurements  *

Aligning            *

Aluminising       *

Reference:        *

 

Main website of the INT

http://www.ing.iac.es/Astronomy/telescopes/int/index.html

 

Optical specifications

Element

Shape

Working Diameter (mm)

Asphericity

Focal length (mm)

Separation from primary (mm)

Primary

Concave Parabolic

2540

-1

7475

 

Secondary

Convex Hyperbolic

531

-2.214

-1813

6017

Finder:

Primary

Flat

 

Parabolic

Flat

 

405

135

 

-1

0

 

2104

 

 

1600

 

 

Focal Station

Prime (uncorrected)

Prime (corrected)

Cassegrain

TV finder

Focal length (mm)

7475

8357

38130

2104

Focal ratio

F/2.94

F/3.29

F/15

F/16

Field diameter

(arcmin)

(no vignetting)

(50%vignetting)

 

 

 

 

 

40

52

 

 

20

22

 

 

15

Scale (arcsec/mm)

27.6

24.7

5.41

98

Diameter of central obstruction (mm)

914

914

914

139

Focus/mirror shift (1)

 

 

27

 

1) Movement of focus position for unit movement of secondary mirror

 

Mechanical specifications

Element

Shape

Total Diameter (mm)

Expn. Coef. (1/K)

Material

Primary

Concave Parabolic

2540

-0.7x10-6

Zerodur

Secondary

Convex Hyperboloid

531

 

Fused silica

Finder:

Primary

Flat

 

Parabolic

Flat

 

405

135

 

 

Pyrex

Low expn glass

 

Cleaning

Dates of snowcleaning

Document of the snowcleaning

Measurements of snowcleaning before and after

 

Measurements

Aligning

Aligning

Documents of the aligning procedures

 

Aluminising

Dates of last aluminising.

Measurements before and after the aluminising.

 

Reference:

D.Carter, U.Sharan & R.E.S.Clegg