INSTRUCTION MANUAL Orion ® Apex™ Maksutov-Cassegrain Optical Tube Assemblies™ #9820 Apex 90mm #9823 Apex 102mm #9825 Apex 127mm Customer Support (800) 676-1343 E-mail: support@telescope.com Corporate Offices (831) 763-7000 Providing Exceptional Consumer Optical Products Since 1975 P.O. Box 1815, Santa Cruz, CA 95061 IN 161 Rev.
Finder scope bracket Eyepiece adapter Correct-image finder scope 25mm Sirius Plössl eyepiece Dovetail holder 45° correct-image diagonal Meniscus lens Focus knob Mounting block Figure 1: The Apex Maksutov-Cassegrain optical tube assembly parts diagram. The Apex 102mm is shown, but all models have similar components.
Getting Started The Apex telescopes come nearly fully assembled from the factory. The optics have been installed and collimated, so you should not have to make any adjustments to them. Open the box and inspect the contents to make sure all of the parts listed above are present. Refer to Figure 1 to see what the parts look like, and how they will connect togther; the Apex 102mm is shown, but all models have similar components. Please keep the original shipping box.
Camera tripods or altazimuth mounts are desireable for terrestrial (land) viewing because they allow simple vertical and horizontal movement of the telescope. An equatorial mount is desirable for astronomical viewing because it allows easy tracking of celestial objects as the Earth rotates. Also, the setting circles on the mount enable you to locate objects by their celestial coordinates (right ascension and declination), which can be found in many observing books and star atlases.
Objective lens Alignment thumb screws Focus lock ring Eyepiece Spring-loaded tensioner Figure 5. The 6x26 correct-image finder scope and bracket. and less sharp (this is a fundamental law of optics). The steadiness of the air (the “seeing”) can also limit how much magnification an image can tolerate. Always start viewing with your lowest-power (longest focal length) eyepiece in the telescope.
No surface markings can be seen on Venus, which is always shrouded in dense clouds. MARS If atmospheric conditions are good, you may be able to see some subtle surface detail on the Red Planet, possibly even the polar ice cap. Mars makes a close approach to Earth every two years; during those approaches its disk is larger and thus more favorable for viewing. C. Stars Stars will appear like twinkling points of light in the telescope.
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.
One-Year Limited Warranty The Apex Maksutov-Cassagrain Opitcal Tube Assemblies are warranted against defects in materials or workmanship for a period of one year from the date of purchase. This warranty is for the benefit of the original retail purchaser only.
