Celestron 52265 Manual - Página 3
Procurar online ou descarregar pdf Manual para Telescópio Celestron 52265. Celestron 52265 4 páginas. C90mm mak
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viewing, out-of-focus star images are very diffuse making them difficult, if not impossible, to see. If you turn the focus knob too quickly,
you can go right through focus without seeing the image. For best results, your first astronomical target should be a bright object (like the
Moon) so that the image is visible even when out of focus.
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To determine the magnification of your spotting scope, simply divide the focal length of the spotting scope by the focal length of the
eyepiece used. In equation format, the formula looks like this:
Magnification =
Let's say, for example, you are using the 32mm Plossl eyepiece. To determine the magnification you simply divide the focal length of
your spotting scope (1200mm) by the focal length of the eyepiece, 32mm. Dividing 1200 by 32 yields a magnification of 38 power.
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.
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With the use of an optional photograghic T-adapter (#93635-A) and camera specific T-
ring, a 35mm camera can be attached to the rear cell of the spotting scope. To attach a
camera to your C90 Mak:
1.
Remove the erect image diagonal and eyepiece from the rear cell of the tube.
2.
Thread the T-Ring onto the T-Adapter.
3.
Mount your camera body onto the T-Ring the same as you would any other lens.
4.
Thread the T-Adapter onto the back of the C90 by rotating the slip ring clockwise
while holding the camera in the desired orientation (either vertical or
horizontal).
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All specifications given with standard eyepiece and are subject to change without notice.
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Focal Length of Spotting scope (mm)
Focal Length of Eyepiece (mm)
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Model
Optical Design
Aperture (mm)
Focal Length (mm)
Eyepiece
Angular Field of View (FOV°)
Linear FOV (ft. @ 1000 yd)
Eye Relief
Near Focus
Coating
Length
Weight
Figure 1-4 – Optional T-adapter and T-ring
attachment onto the rear cell.
52265
Maksutov-Cassegrain
90
1200
32mm
1.4°
73ft
22mm
20ft
Multi-Coated
11 in
3.1 lbs