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Meade autostar manual pdf7/6/2023 ![]() Eye damage is often painless, so there is no warning to the observer that damage has occurred until it is too late. Never use a Meade ® LX90 Telescope to look at the Sun! Looking at or near the Sun will cause instant and irreversible damage to your eye. 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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