Meade LX200R Manuale delle Istruzioni Scaricare il pdf (Pagina 2)

NOTE: Instructions for the use of optional accessories

are not included in this manual. For details see the

Meade General Catalog.

The Meade Schmidt-Cassegrain Optical System (Diagram not to scale)

In the Schmidt-Cassegrain design of the Meade 16” model, light

enters from the right, passes through a thin lens (correcting plate)

with two-sided aspheric correction, proceeds to a spherical

primary mirror, and then to a convex aspheric secondary 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.

The 16” model includes an oversize 16.375” primary mirror,

yielding a fully illuminated field-of-view significantly wider than is

possible with standard-size primary mirrors. Note that light ray (2)

in the figure would be lost entirely, except for the oversize

p r i m a r y. This phenomenon results in Meade 16” Schmidt-

Cassegrains having off-axis field illuminations 10% greater,

aperture-for-aperture, than other Schmidt-Cassegrains utilizing

standard-size primary mirrors.

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Meade LX200R Manuale delle Istruzioni Pagina 2