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6
Actual image orientation as seen
with the unaided eye
Inverted image, as viewed with
the eyepiece directly in telescope
Reversed from left to right, as
viewed with a Star Diagonal
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 reflectors, use mirrors. The EdgeHD
optical system (Apanatic Schmidt) uses a combination of mirrors and lenses and is referred to as a compound or catadioptric
telescope. This unique design offers 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 field flattening lens integrated into the baffle tube . Once light rays enter the optical system, they travel the
length of the optical tube three times.
The optics of an EdgeHD telescopes have Starbright XLT coatings - enhanced multi-layer coatings on the primary and
secondary mirrors for increased reflectivity and a fully coated corrector for the finest anti-reflection characteristics.
Inside the optical tube, a black tube extends out from the center hole in the primary mirror. This is the primary baffle tube
and it prevents stray light from passing through to the eyepiece or camera.
Image Orientation
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 EdgeHD design.
Figure 2
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2
Figure 2-1
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