optics. Wipe the lens gently in a circular motion, then remove any excess fluid with a fresh lens tissue. Oily fingerprints and 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:
Aperture: 90mm
Effective focal length: 1250mm
Focal ratio: f/13.9
Central obstruction diameter: 29mm
Primary mirror coating: Aluminum with overcoat
Meniscus lens coating:
Eyepiece adapter: Accepts 1.25” format accessories, camera
Eyepiece: 25mm Sirius Plossl, fully coated with
Magnification with supplied eyepiece: 50x
Actual field of view with supplied eyepiece: 0.96°
Diagonal: 45°
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
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:
Aperture: 102mm
Effective focal length: 1300mm
Focal ratio: f/12.7
Central obstruction diameter: 31mm
Primary mirror coating: Aluminum with overcoat
Meniscus lens coating:
Eyepiece adapter: Accepts 1.25” format accessories, camera
Eyepiece: 25mm Sirius Plossl, fully coated with
Magnification with supplied eyepiece: 52x
Actual field of view with supplied eyepiece: 0.92°
Diagonal: 45°
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
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:
Aperture: 127mm
Effective focal length: 1540mm
Focal ratio: f/12.1
Central obstruction diameter: 39mm
Primary mirror coating: Aluminum with overcoat
Meniscus lens coating:
Eyepiece adapter: Accepts 1.25” format accessories, camera
Eyepiece: 25mm Sirius Plossl, fully coated with
Magnification with supplied eyepiece: 62x
Actual field of view with supplied eyepiece: 0.77°
Diagonal: 45°
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
Case: Deluxe carry case for optical tube included
Weight: 8.6 lbs
Length: 14.5” (without eyepiece or diagonal attached)
7