TESTING TELESCOPES 90°-VI EWING – WITH DOUBLE MICROMETER
Testing telescopes with mechanical double micrometer allow the measurement of deflection angles in two directions. The movement of the eyepiece reticle in x- and y-direction in the image plane can be read from the scale of the micrometer drums. The scale division (SD) is 5 µm. The following figure shows the set-up of a testing telescope with 90° viewing. In contrast to a testing telescope with straight viewing the image appears upright and laterally reversed.
Application examples (additional collimator required):
■ Measurement of deflection angles
■ Parallelism measurement of uncoated flats
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 and mechanical double micrometer 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)
Meas. Range
SD*
A
L
227 181
FR 50/40/14.7 MD
50
10
3.2°
20.0"
65
116,5
227 182
FR 90/40/14.7 MD
90
16
2.0°
11.5"
65
116,5
227 183
FR 140/40/14.7 MD
140
28
1.2°
7.5"
118
169,5
227 184
FR 200/40/14.7 MD
200
28
0.8°
5.0"
173
224,5
227 185
FR 300/40/14.7 MD
300
28
0.6°
3.5"
274
325,5
227 186
FR 500/40/14.7 MD
500
28
0.4°
2.0"
474
525,5
*SD (scale division) = corresponding angle value in arcsec of one scale division of the micrometer screw
Mid-size Apertures
Art. No.
Description
Focal Length (mm)
Clear Aperture (mm)
Meas. Range
SD*
A
L
227 187
FR 300/65/14.7 MD
300
50
0.6°
3,5"
233
346,0
227 188
FR 500/65/14.7 MD
500
50
0.4°
2.0"
415
528,0
227 189
FR 500T/65/14.7 MD**
500
50
0.4°
2.0"
233
346,0
*SD (scale division) = corresponding angle value in arcsec of one scale division of the micrometer screw
**Compact design