TESTING TELESCOPES STRAIGHT VI EWING – WITH DOUBLE MICROMETER
28
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.
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 straight viewing and mechanical double micrometer is as follows:
Important: Please specify reticle when ordering.
Small-size Apertures with MD
Art. No.
Description
Focal Length (mm)
Clear Aperture (mm)
Meas. Range
SD*
L
227 161
FG 50/40/14.7 MD
50
10
3.2°
20.0"
65
227 162
FG 90/40/14.7 MD
90
16
2.0°
11.5"
65
227 163
FG 140/40/14.7 MD
140
28
1.2°
7.5"
118
227 164
FG 200/40/14.7 MD
200
28
0.8°
5.0"
173
227 165
FG 300/40/14.7 MD
300
28
0.6°
3.5"
274
227 166
FG 500/40/14.7 MD
500
28
0.4°
2.0"
474
*SD (scale division) = corresponding angle value in arcsec of one scale division of the micrometer screw
Mid-size Apertures with MD
Art. No.
Description
Focal Length (mm)
Clear Aperture (mm)
Meas. Range
SD*
L
227 167
FG 300/65/14.7 MD
300
50
0.6°
3,5"
233
227 168
FG 500/65/14.7 MD
500
50
0.4°
2.0"
415
227 169
FG 500T/65/14.7 MD**
500
50
0.4°
2.0"
233
*SD (scale division) = corresponding angle value in arcsec of one scale division of the micrometer screw
**Compact design
Large-size Apertures with MD
Art. No.
Description
Focal Length (mm)
Clear Aperture (mm)
Meas. Range
SD*
D
a
b
c
d
e1
e2
227 172
FG 600/105/14.7 MD
600
100
0.30°
1.7"
Ø128 f7
530
46
-
58
154
78
227 173
FG 1100/105/14.7 MD
1100
78
0.16°
1.0"
Ø105 f7
1045
66
50
30
165
100
*SD (scale division) = corresponding angle value in arcsec of one scale division of the micrometer screw