Orion PRO 120 EQ instruction manual Specifications, Cleaning Lenses

Pair of collimating screws (3)

Figure 16. The lens cell of the SkyView Pro 120. There are three pairs of collimating screws; each pair of screws work together to adjust the tilt of the lens.

outdoors, although storage in a garage or shed is OK. Small components like eyepieces and other accessories should be kept in a protective box or storage case. Keep the dust cover on the front of the telescope when not in use.

Your SkyView Pro 120 EQ 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 telescope. 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 exposed lenses of your telescope’s objec- tive lens, 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 par- ticles 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 fingerprints and smudges may be removed using this method. Use caution; rubbing too hard may scratch the lens. For the objective lens, clean only a small area at a time, using a fresh lens tissue on each area. Never reuse tissues.

11. Specifications

Objective lens: Achromatic doublet, air-spaced

Objective lens coating: Multi-coated

Objective lens diameter: 120mm (4.7")

Focal length: 1000mm

Focal ratio: f/8.3

Eyepieces: 25mm and 10mm Sirius Plössls, fully coated, 1.25"

Magnification: 40x (with 25mm) and 100x (with 10mm)

Finder Scope: 8x40 Achromatic, 5.33° field of view

Focuser: Rack and4pinion, accepts 1.25" or 2" accessories and camera T-Ring

Diagonal: 90° Star diagonal, mirror type, 1.25"

Mount: SkyView Pro, German equatorial

Tripod: Steel

Tripod support tray: Aluminum, provides additional stability, holds five 1.25" eyepiece and two 2" eyepieces

Weight: 41 lbs. (Mount 30 lbs., optical tube 11 lbs.)

Polar axis latitude adjustment: 8° to 70°

Polar axis finder: Optional

Motor Drives: Optional

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