8. Specifications

 

Telescope

 

 

 

 

Magnification

30 X

 

 

 

Effective aperture

45 mm

 

 

 

Resolving power

3”

 

 

 

Field of view

1° 30’

 

 

 

Minimum focus distance

1.35 m

 

 

 

Stadia ratio

100

 

 

 

Stadia constant

0

 

 

 

 

 

 

 

 

Angle Measurement

 

 

 

 

Type

Incremental rotary encoder

 

 

Detection mode

V. angle:

Single

 

 

 

H. angle:

Dual

 

Minimum Display (Selectable)

 

 

 

ETH-302 1”/5”

 

 

 

 

ETH-305 1”/5”

 

 

 

 

ETH-310 5”/10”

 

 

 

 

ETH-320 10”/20”

 

 

 

 

Accuracy (DIN18723, Standard deviation)

 

 

 

ETH-302 2”

 

 

 

 

ETH-305 5”

 

 

 

 

ETH-310 10”

 

 

 

 

ETH-320 20”

 

 

 

 

 

 

 

 

 

Vertical Angle Compensation

 

 

 

Method

Automatic compensation

 

 

 

 

 

 

Stadia Ratio

100

 

 

 

Stadia Constant

0

 

 

 

 

 

 

 

 

Display

 

 

 

 

Type

Dot matrix LCD/Two lines

 

Display panel

Dual display

 

 

45

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Pentax ETH-302, ETH-310, ETH-305 Specifications, Telescope, Angle Measurement, Vertical Angle Compensation, Display