Celestron C90 MAK Manual De Instrucciones página 3

Although the power is variable, each instrument under average skies has a limit to the highest useful magnification. The general rule is that 60 power
can be used for every inch of aperture. For example, the C90 is 3.5 inches in diameter. Multiplying 3.5 by 60 gives a maximum useful magnification of
210 power. Although this is the maximum useful magnification, most observing is done in the range of 20 to 35 power for every inch of aperture which
is 70 to 123 times for the C90 spotting scope. Lower powers give you brighter images but experiment to see what is best for you.
Attaching a Camera
1. T-Adapter threads are built into the rear of the spotting scope (see right portion of image to the left).
With a camera specific T-ring, a Digital SLR (or SLR) camera can be attached to the spotting scope.
2. Remove the erect image diagonal and eyepiece from the rear cell of the tube.
3. Thread the T-Ring onto the rear opening which contains the threads (T-Adapter) – see image to the left.
4. Mount your camera body onto the T-Ring the same as you would any other lens.
Note: Since digital cameras (not digital SLR cameras) do not use the T-system to mount cameras to lenses, spotting
scopes, telescopes, etc. you need a different way to be able to use them to take photos. Celestron offers a Universal
Digital Camera Adapter (Model # 93626) which makes it easy to attach most digital cameras to your spotting scope.
Maintenance
To protect your spotting scope when not being used, put on all lens covers and caps to keep the optics clean and then put the scope in its backpack.
If your optics could use cleaning, use an optics cleaning kit and follow the instructions.
SPECIFICATIONS
Optical Design
Aperture
Focal Length
Focal Ratio
Optical Coatings
Finderscope, Erect Image
Eyepiece - 1.25" Plossl
Angular Field of View
Linear FOV – ft@1000yds / m@1000m
Eye Relief
Near Focus
Length w/diagonal & eyepiece
Weight w/diagonal & eyepiece
Note: Specifications subject to change without notice or obligation
Warranty
Celestron Spotting Scopes have the Celestron Limited Lifetime Warranty for the U.S.A. and Canadian customers.
For complete details of eligibility and for warranty information on customers in other countries visit the Celestron website.
2835 Columbia St.
Torrance, California 90503 U.S.A.
Téléphone: 310.328.9560 • Fax: 310.212.5835
www.celestron.com
©2012 Celestron All Rights Reserved • 06-12
Product design and specifications are subject to change without prior notice
This product is designed and intended for use by those 14 years of age and older.
Maksutov-Cassegrain
90 mm (3.5")
1250 mm
f/13.9
Multi-Coated
8x21
32 mm (39x)
1.3° w/32 mm
w/32 mm – 68/23
20 mm
15 feet (4.6 m)
16" (41 cm)
5lbs (2.3 Kg)