TESTING TELESCOPES 90°-VI EWING
The basic function and design of testing telescopes with 90° viewing is the same as of testing telescopes with straight viewing.
The testing telescopes with 90° viewing contain an additional folding mirror. This kind of testing telescope is used for vertical set-ups or for set-ups on optical tables where straight viewing is not practical from point of view of ergonomics and space.
Application examples (additional collimator required):
■ Measurement of angular displacement
■ Parallelism measurement of uncoated flats
■ Testing of the imaging properties of optical elements and systems
■ Measurement of the focal length of negative optical systems/ elements (additional attachment achromat required)
Notes on ordering:
■ Testing telescope eyepiece is commonly f=14,7 mm but can be equipped with eyepieces f=25 mm or f=10 mm on request.
■ One reticle and one eyepiece are included in the standard instrument.
■ If not specified otherwise, the testing telescope is adjusted to infinity at 546 nm wavelength. Adjustment to other distances or wavelengths is also possible on demand.
■ The nomenclature of the testing telescopes with 90°-viewing is as follows:
Important: Please specify reticle when ordering. Please specify direction of use if reticles with lettering are used so that the lettering will be right-side-up.
Small-size Apertures
Art. No.
Description
Focal Length (mm)
Clear Aperture (mm)
Field of View
A
L
227 041
FR 50/40/14.7
50
10
10.0°
65
116,5
227 042
FR 90/40/14.7
90
16
6.0°
65
116,5
227 043
FR 140/40/14.7
140
28
4.0°
118
169,5
227 044
FR 200/40/14.7
200
28
3.0°
173
224,5
227 045
FR 300/40/14.7
300
28
2.0°
274
325,5
227 046
FR 500/40/14.7
500
28
1.0°
474
525,5
Mid-size Apertures
Art. No.
Description
Focal Length (mm)
Clear Aperture (mm)
Field of View
A
L
227 047
FR 300/65/14.7
300
50
2.0°
233
346,0
227 048
FR 500/65/14.7
500
50
1.0°
415
528,0
227 049
FR 500T/65/14.7*
500
50
1.0°
233
346,0
*Compact design
Large-size Apertures
Art. No.
Description
Focal Length (mm)
Clear Aperture (mm)
Field of View
D
a
b
c
d
e1
e2
227 052
FR 600/128/14.7
600
100
0.8°
Ø128 f7
530
46
-
58
154
78
227 053
FR 1100/105/14.7
1100
78
0.5°
Ø105 f7
1045
66
50
30
165
100