13
adapter. Also keep the finder scope caps on if you leave it
attached to the optical tube.
Cleaning the Tube
Your StarMax 90mm EQ telescope requires very little
mechanical maintenance. The optical tube is aluminum and
has a smooth painted finish that is fairly scratch-resistant. If a
scratch does appear on the tube, it will not harm the tele-
scope. If you wish, you may apply some auto touch-up paint
to the scratch. Smudges on the tube can be wiped off with a
soft cloth and a household cleaner such as Windex or
Formula 409.
Cleaning Lenses
Any quality optical lens cleaning tissue and optical lens clean-
ing fluid specifically designed for multi-coated optics can be
used to clean the StarMax’s front meniscus lens or exposed
lenses of your eyepieces or finder scope. Never use regular
glass cleaner or cleaning fluid designed for eyeglasses.
Before cleaning with fluid and tissue, however, blow any loose
particles off the lens with a blower bulb or compressed air.
Then apply some cleaning fluid to a tissue, never directly on
the optics. Wipe the lens gently in a circular motion, then
remove any excess fluid with a fresh lens tissue. Oily finger-
prints 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.
10. Specifications
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" accessories, camera t-
threads
Eyepiece: 25mm Sirius Plössl, fully coated with multi-coat-
ings, 1.25" barrel diameter
Magnification with supplied eyepiece: 50X
Actual field of view with supplied eyepiece: .96°
Diagonal: 90° mirror star diagonal, 1.25"
Finder scope: 6x magnification, 20mm aperture, correct-
image, achromatic, 6.2° field
Finder scope bracket: Dovetail base, spring-loaded X-Y align-
ment
Optical tube mounting block: Fits standard photo-style tripods
Mount: EQ-1, German-type equatorial
Slow-motion controls: R.A. and Dec. axes
Setting Circles: R.A. scaled in 10 minute increments, Dec.
scaled in 2.5° increments
Latitude range: 10° to 70°
Tripod: Adjustable-height aluminum legs, accessory tray
included
Case: Deluxe carry case for optical tube included, padded
case for EQ-1 mount optional
Motor drives: Optional
Weight: 15.8 lbs (tube 3.7 lbs, mount 12.1 lbs)
