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Celestron FirstScope 90AZ Instruction Manual

Celestron firstscope 90az: instruction manual
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Summary of Contents for Celestron FirstScope 90AZ

  • Page 2 1. Objective Lens 2. Tube Rings 3. Piggyback Camera Adapter 4. Star Pointer Finderscope 5. Eyepiece 6. Erect Image Diagonal 7. Focuser 8. Slow Motion Cables 9. Tripod 10. Eyepiece Accessory Tray...
  • Page 3 Thank you for purchasing this Celestron Refractor Telescope. This telescope is a precision scientific instrument. With it you will enjoy numerous objects in the sky—planets, nebulae, star clusters, galaxies and other astronomical objects. Your refractor telescope can also be used as an excellent spotting scope for viewing daytime land objects as well.
  • Page 4 Star Pointer Finderscope The Star Pointer is the quickest and easiest way to point your telescope exactly at a desired object in the sky. It's like having a laser pointer that you can shine directly onto the night sky. The Star Pointer is a zero magnification pointing tool that uses a coated glass window to superimpose the image of a small red dot onto the night sky.

  • Page 5: Image Orientation

    Altitude • For major directional changes in altitude, hold the end of the telescope tube and move the telescope to the desired orientation. • For fine adjustments in altitude, turn the slow motion control knob on the right side of the mount. Turning the knob clockwise lowers the angle at which the telescope is aiming while turning it counterclockwise raises the angle at which the telescope is aiming.
  • Page 6 This inconsistency can and will affect the ability to focus your telescope. In most cases, you will not be able to achieve a truly sharp focus. In some cases, you may actually see a double image.
  • Page 7 Continuing with our example, multiply the angular field .9° by 52.5. This produces a linear field width of over 47 feet at a distance of one thousand yards. The apparent field of each eyepiece that Celestron manufactures is found in the Celestron...

  • Page 8: Celestial Observing

    Now that your telescope is set up, you’re ready to use it for observing. This section covers visual observing for both solar system and deep-sky objects. Observing the Moon In the night sky, the moon is a prime target for your first look because it is extremely bright and easy to find. Although the This effect is more noticeable at higher power.

  • Page 9: Seeing Conditions

    Your Firstscope 90 AZ also makes an excellent daytime spotting scope. For daytime viewing, the 45˚ erect image diagonal must be inserted into the telescope's focuser. For correct viewing of land objects make sure the eyepiece is pointing straight up out of the diagonal. Rotating the eyepiece and diagonal to either side will cause the image to also rotate in the field of view of the eyepiece.
  • Page 10 Photography Hints Your Celestron can be used for both terrestrial and astronomical photography. Celestron telescopes have fixed apertures and, as a result, fixed f/ratios. To properly expose your subjects photographically you need to set your shutter speed accordingly.

  • Page 11: Telescope Maintenance

    B. A small amount of dust on any optical surface is ok. If the dust builds up then use a can of compressed air and then a camel's hair brush to remove the dust. C. If the lens need cleaning, it should be cleaned by a professional. Either have your instrument serviced by a telescope repair facility or return it to the factory.

  • Page 12: Optional Accessories

    Ultimas. Filters Sets, Eyepiece - Celestron offers four convenient filter sets, which contain four different filters per set. Not only are these highly useful filter combinations, but they also offer an economical way to add versatility to your filter collection.
  • Page 13 T-Adapter (#93625) - T-Adapter (with additional T-Ring) allows you to attach your SLR camera to the rear cell of your Celestron telescope. This turns your telescope into a high power telephoto lens perfect for terrestrial photography and short exposure lunar and filtered solar photography.

  • Page 14: Celestron Two Year Warranty

    Celestron, is found to be defective in materials or workmanship. As a condition to the obligation of Celestron to repair or replace such product, the product must be returned to Celestron together with proof-of-purchase satisfactory to Celestron.
  • Page 15 Celestron 2835 Columbia Street Torrance, CA 90503 U.S.A. Tel. (310) 328-9560 Fax. (310) 212-5835 Web site at www.celestron.com Copyright 2004 Celestron All rights reserved. (Products or instructions may change without notice or obligation.) Item # 21084-INST $10.00 01-05 Printed in China...

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