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smudges may be removed using this method. Use caution;
rubbing too hard may scratch the lens. For the large surface of
the meniscus lens, clean only a small area at a time, using a
fresh lens tissue on each area. Never reuse tissues.
Specifications
#9820 Apex 90mm OTA
Optical design: Maksutov-Cassegrain
Aperture: 90mm
Effective focal length: 1250mm
Focal ratio: f/13.9
Central obstruction diameter: 29mm
Primary mirror coating: Aluminum with overcoat
Meniscus lens coating: Anti-reflection multi-coatings on both
sides of lens
Eyepiece adapter: Accepts 1.25" format accessories, camera
t-threads
Eyepiece: 25mm Sirius Plossl, fully coated with multi-coat-
ings, 1.25" format
Magnification with supplied eyepiece: 50x
Actual field of view with supplied eyepiece: 0.96°
Diagonal: 45° correct-image diagonal, 1.25" format
Near focus (with supplied eyepiece and diagonal):
Approximately 13.5 feet
Finder scope: 6x magnification, 20mm aperture, correct-
image, achromatic, 6.2° field
Optical tube mounting block: Fits standard photo-style
tripods
Case: Deluxe carry case for optical tube included
Weight: 3.7 lbs
Length: 10.5" (without eyepiece or diagonal attached)
#9823 Apex 102mm OTA
Optical design: Maksutov-Cassegrain
Aperture: 102mm
Effective focal length: 1300mm
Focal ratio: f/12.7
Central obstruction diameter: 31mm
Primary mirror coating: Aluminum with overcoat
Meniscus lens coating: Anti-reflection multi-coatings on both
sides of lens
Eyepiece adapter: Accepts 1.25" format accessories, camera
t-threads
Eyepiece: 25mm Sirius Plossl, fully coated with multi-coat-
ings, 1.25" format
Magnification with supplied eyepiece: 52x
Actual field of view with supplied eyepiece: 0.92°
Diagonal: 45° correct-image diagonal, 1.25" format
Near focus (with supplied eyepiece and diagonal):
Approximately 11 feet
Finder scope: 6x magnification, 26mm aperture, correct-
image, achromatic, 6.3° field
Optical tube mounting block: Fits standard photo-style
tripods
Case: Deluxe carry case for optical tube included
Weight: 4.8 lbs
Length: 12.0" (without eyepiece or diagonal attached)
#9825 Apex 127mm OTA
Optical design: Maksutov-Cassegrain
Aperture: 127mm
Effective focal length: 1540mm
Focal ratio: f/12.1
Central obstruction diameter: 39mm
Primary mirror coating: Aluminum with overcoat
Meniscus lens coating: Anti-reflection multi-coatings on both
sides of lens
Eyepiece adapter: Accepts 1.25" format accessories, camera
t-threads
Eyepiece: 25mm Sirius Plossl, fully coated with multi-coat-
ings, 1.25" format
Magnification with supplied eyepiece: 62x
Actual field of view with supplied eyepiece: 0.77°
Diagonal: 45° correct-image diagonal, 1.25" format
Near focus (with supplied eyepiece and diagonal):
Approximately 27 feet
Finder scope: 6x magnification, 26mm aperture, correct-
image, achromatic, 6.3° field
Optical tube mounting block: Fits standard photo-style
tripods
Case: Deluxe carry case for optical tube included
Weight: 8.6 lbs
Length: 14.5" (without eyepiece or diagonal attached)
7
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