Meade Instruments ETX 60AT - Manual (Page 29)

Telescope moves off a terrestrial object while observing:
•
Verify that the vertical and horizontal locks have been tightened to a "firm feel" ( 6 and 9 Fig. 1).
Telescope pauses when changing slew direction:
•
This pause is normal.
A terrestrial object appears reversed left-for-right:
•
An eyepiece in the standard 90° observing position ( 3, Fig. 1) yields this image orientation. To
view a correctly oriented image, the optional #933 Erecting Prism is required. See “OPTIONAL
ACCESSORIES,” page 25.
Meade Customer Service
If you have a question concerning your ETX-60AT or ETX-70AT, contact the Meade Instruments
Customer Service Department at:
Telephone: (949) 451-1450
Customer Service hours are 8:30 AM to 4:30 PM, Pacific Time, Monday through Friday. In the unlike-
ly event that the ETX requires factory servicing or repairs, write or call the Meade Customer Service
Department first, before returning the telescope to the factory, giving full particulars as to the nature of
the problem, as well as your name, address, and daytime telephone number. The great majority of
servicing issues can be resolved by telephone, avoiding return of the telescope to the factory.
ETX-60AT/ETX-70AT Specifications
Optical design ................................................................Achromatic Refractor
Clear aperture
ETX-60AT ..............................................................60mm (2.36”)
ETX-70AT ..............................................................70mm (2.76”)
Focal length ....................................................................350mm
Focal ratio (photographic speed)
ETX-60AT ..............................................................f/5.8
ETX-70AT ..............................................................f/5
Near focus (approx.)
ETX-60AT ..............................................................15 ft. (4.6m)
ETX-70AT ..............................................................17 ft. (5.2m)
Resolving power
ETX-60AT ..............................................................1.9 arc secs
ETX-70AT ..............................................................1.6 arc secs
Multi-coatings on objective lens ....................................Standard
Limiting visual stellar magnitude (approx.)
ETX-60AT ..............................................................11.2
ETX-70AT ..............................................................11.5
Image scale
ETX-60AT ..............................................................4.1°/inch
ETX-70AT ..............................................................4.1°/inch
Maximum practical visual power
ETX-60AT ..............................................................200X
ETX-70AT ..............................................................240X
Optical tube dimensions
(dia. x length) ..........................................................9.3cm x 30.4-37.1cm (3.6” x 12-14.6”)
Eyepieces
Modified Achromatic ..............................................MA 25mm (1.25” O.D.)
Modified Achromatic ..............................................MA 9mm (1.25” O.D.)
Telescope mounting........................................................Fork type; double tine
Setting circle diameters ..........................................Dec: 3.5”; RA: 7”
Input voltage ..........................................................9-volts DC
Motor Drive System ................................................DC servo motors with encoders, both axes
Maintenance 29