Spectra Precision Focus 30 Service Manual

Chapter 3
Theory of Operation
P/N 79000035_SM, Version 1.5 3 - 5 Focus 30/35 Service Manual
Technical specification
• Magnification: 31 x
• Clear aperture: 50 mm
• Field of view: 1,5 degrees, 2,6 m at 100 m (8.5 ft at 328 ft)
• Focusing range: 1,5 to ...
• Reticle illumination: wavelength: green 590 nm, variable in 10 steps
Functional description
The telescope has some additional features, like:
• In order to aim with high accuracy, an illuminated reticle (cross hair) is placed in the image
plane between the eyepiece and the erecting prism (Porro prism).
• The motorized focusing drive (Servo Focus) moves the focusing lens.
• A transmitter prism mounted behind the front lens diverts the laser pointer and tracker
transmitter signal.
• Two selective mirrors are situated in the optical path to divert the optical signals to the distance
meter and the camera tracker receiver : Mirror 1 reflects the wavelength of 785 nm towards
the tracker receiver camera.Mirror 2 reflects the wavelength of 660 nm to and from the EDM.
Fig. 3-4 Principle schematic of the telescope
Transmitter prism
Mirror 1
Camera Tracker
Mirror 2
EDM
Focussing lens
Reticle
Eyepiece
Porro prism
Reticle illumination
Motorized focusing drive
Front lens

Spectra Precision Focus 30 Specifications

General

Brand	Spectra Precision
Model	Focus 30
Category	Measuring Instruments
Language	English