TESTING TELESCOPES 60°-VI EWING/60°-VI EWING WITH DOUBLE MICROMETER
The basic function and design of testing telescopes with 60°- viewing is the same as of testing telescopes with 90°- viewing. The testing telescopes with 60° viewing contain a folding mirror (see following figure). The image appears upright but laterally reversed. This kind of testing telescopes is used for horizontally set-ups because the 60°- viewing is more ergonomic. The testing telescopes with 60° viewing (figure A) are available also with mechanical micrometer (figure B) and digital double micrometers (figure C). The scale division (SD) of the mechanical micrometer drum is 5 µm. For a general description of the operating principle of testing telescopes with double micrometers see page 28 and 30 respectively.
TYPE FW
60°-Viewing
Art. No.
Description
Focal Length (mm)
Clear Aperture (mm)
Field of View
L
227 067
FW 300/65/14.7
300
50
2.0°
233
227 068
FW 500/65/14.7
500
50
1.0°
415
227 069
FW 500T/65/14.7*
500
50
1.0°
233
*Compact design
TYPE FW MD
60°-Viewing with MD
Art. No.
Description
Focal Length (mm)
Clear Aperture (mm)
Meas. Range
SD*
L
227 177
FW 300/65/14.7 MD
300
50
0.6°
3.5"
233
227 178
FW 500/65/14.7 MD
500
50
0.4°
2.0"
415
227 179
FW 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
TYPE FW MDD
60°-Viewing with MDD
Art. No.
Description
Focal Length (mm)
Clear Aperture (mm)
Meas. Range
Resolution
L
227 217
FW 300/65/14.7 MDD
300
50
0.6°
1.0"
233
227 218
FW 500/65/14.7 MDD
500
50
0.4°
0.5"
415
227 219
FW 500T/65/14.7 MDD*
500
50
0.4°
0.5"
233
*Compact design