Sight along the side of the telescope’s main tube to locate an object. Place the Super Plössl 26mm eyepiece into the diagonal prism and tighten the attachment thumbscrew to a firm feel only. Slide the diagonal prism into the eyepiece holder and lock in place by turning the thumbscrew to a firm feel. Thread the eyepiece holder into the rear cell thread. Remove the dust cap from the rear cell of the telescope. Remove the dust cover from the end of the telescope tube.ġ1. Tighten, to a firm feel only, the Dec and R.A. "9" is the fastest speed and "1" is slowest speed. To change the telescope’s slew speed, press the Number keys. You can now use the Arrow keys to slew (move) the telescope up, down, right, or left. Press the key prompted by Autostar to accept the Sun warning. Īppendix A: Equatorial (Polar) Alignment. īasic Autostar Operation.Īutostar Navigation Exercise. To Track an Object Automatically.Īlt/Az Home Position. Observing By Moving the Telescope Manually. How to Attach the Tripod to the Telescope. "LX90" is a trademark of Meade Instruments Corporation. Patent Office and in principal countries throughout the world. ® The name "Meade" and the Meade logo are trademarks registered with the U.S.
These field stops effectively block off-axis stray light rays. Field stops machined into the inside-diameter surface of the primary mirror baffle tube significantly increase lunar, planetary, and deep-space image contrast. It is this phenomenon which results in Meade SchmidtCassegrains having off-axis field illuminations about 10% greater, aperture-for-aperture, than other Schmidt-Cassegrains utilizing standard-size primary mirrors. Note that light ray (2) in the figure would be lost entirely, except for the oversize primary. The Meade 8" LX90 Schmidt-Cassegrain includes an oversize primary mirror of an 8.25" diameter, yielding a fully illuminated field-of-view significantly wider than is possible with a standard-size primary mirror. The convex secondary mirror multiplies the effective focal length of the primary mirror and results in a focus at the focal plane, with light passing through a central perforation in the primary mirror. In the Schmidt-Cassegrain design of the Meade LX90, light enters from the right, passes through a thin lens with 2-sided aspheric correction (“correcting plate”), proceeds to a spherical primary mirror, and then to a convex secondary mirror. The Meade Schmidt-Cassegrain Optical System
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