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ing optical surfaces with your fingers, as skin oil may etch
optical coatings.
To remove fingerprints or smudges from a lens, use photo-
graphic-type lens cleaning fluid and lint-free optical lens
cleaning tissue. Do not use household cleaners or eyeglass-
type cleaning cloth or wipes, as they often contain undesirable
additives like silicone, which don't work well on precision
optics. Place a few drops of fluid on the tissue (not directly on
the lens), wipe gently, then remove the fluid with a dry tissue
or two. Do not "polish" or rub hard when cleaning the lens, as
this will scratch it. The tissue may leave fibers on the lens, but
this is not a problem; they can be blown off with a blower bulb.
Never disassemble the telescope or eyepieces to clean opti-
cal surfaces!
10. Specifications
Optical tube: Seamless aluminum
Objective lens diameter: 90mm (3.5")
Objective lens glass: crown and flint, achromat
Objective lens coating: fully coated with multi-coatings
Focal length: 910mm
Focal ratio: f/10
Eyepieces: 25mm and 10mm Kellner, fully coated, 1.25"
Magnification: 36x (with 25mm), 91x (with 10mm)
Focuser: Rack and pinion
Diagonal: 90° star diagonal, mirror type, 1.25"
Finder scope: 6x magnification, 30mm aperture, achromatic,
crosshairs
Mount: German-type equatorial
Tripod: Aluminum
Motor drives: Optional
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