Manual Celestron CPC Deluxe 800 HD - 11007 (page 20 of 50) (English)

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A telescope is an instrument that collects and focuses light. The nature of

the optical design determines how the light is focused. Some telescopes,

known as refractors, use lenses. Other telescopes, known as reectors,

use mirrors. The EdgeHD optical system (Aplanatic Schmidt) uses a

combination of mirrors and lenses and is referred to as a compound or

catadioptric telescope. This unique design oers large-diameter optics

while maintaining very short tube lengths, making them extremely

portable. The EdgeHD system consists of a zero power corrector plate, a

spherical primary mirror, and a secondary mirror along with a set of eld

attening lens integrated into the bae tube. Once light rays enter the

optical system, they travel the length of the optical tube three times.

The optics of an EdgeHD telescope has StarBright XLT coatings –

enhanced multi-layer coatings on the primary and secondary mirrors

for increased reectivity and a fully coated corrector for the nest

anti-reection characteristics.

Inside the optical tube, a black tube extends out from the center hole in

the primary mirror. This is the primary bae tube, and it prevents stray

light from passing through to the eyepiece or camera.

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Figure 4-1

A cutaway view of the light path of the Edge HD

optical design

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The CPC’s focusing mechanism controls the primary mirror which is

mounted on a ring that slides back and forth on the primary bae tube.

The focusing knob, which moves the primary mirror, is on the rear cell

of the telescope just below the star diagonal and eyepiece. Turn the

focusing knob until the image is sharp. If the knob will not turn, it has

reached the end of its travel on the focusing mechanism. Turn the knob in

the opposite direction until the image is sharp. Once an image is in focus,

turn the knob clockwise to focus on a closer object and counterclockwise

for a more distant object. A single turn of the focusing knob moves the

primary mirror only slightly. Therefore, it will take many turns (about 30)

to go from close focus (approximately 60 feet) to innity.

For astronomical viewing, out of focus star images are very diuse,

making them dicult to see. If you turn the focus knob too quickly,

you can go right through focus without seeing the image. To avoid this

problem, your rst astronomical target should be a bright object (like the

Moon or a planet) so that the image is visible even when out of focus.

Critical focusing is best accomplished when the focusing knob is turned

in such a manner that the mirror moves against the pull of gravity. In

doing so, any mirror shift is minimized. For astronomical observing, both

visually and photographically, this is done by turning the focus knob

counterclockwise.

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The image orientation changes depending on how the eyepiece is

inserted into the telescope. When using the star diagonal, the image is

right-side-up, but reversed from left-to-right (i.e., mirror image).

If inserting the eyepiece directly into the visual back (i.e., without the

star diagonal), the image is upside-down and reversed from left-to-right

(i.e., inverted). This is normal for the Schmidt-Cassegrain design.

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Celestron CPC Deluxe 800 HD - 11007 Manual

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