Celestron 21028 Manual de instrucciones - Página 6

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Celestron 21028 Manual de instrucciones
The magnification (or power) of a telescope varies depending upon the focal length of the eyepiece being used and the
focal length of the telescope.
The PowerSeeker
magnification, use the following formula, in which FL = focal length:
Therefore, if you use the 20mm eyepiece your magnification is 700/20 = 35x. The same formula can be applied to
any of your eyepieces.
Important!
Magnification through any telescope has its limits. These limits are determined by the laws of optics and the nature of
the human eye. Most of your viewing will be done in the range of 35x to 120x. Higher powers are used mainly for
lunar and sometimes planetary observing where you can greatly enlarge the image and the atmospheric conditions are
near perfect. The images at extremely high powers magnify the image, but remember that the contrast will be very
low due to the high magnification. For the brightest images with the most contrast, start by using the lower power
eyepiece with a smaller image scale.
The following magnification levels can be achieved when using the standard eyepiece in conjunction with the 3x
Barlow lens:
With proper care, your telescope should rarely need any maintenance work. To maintain your telescope in the best
possible condition, observe the follow suggestions:
1. When your telescope isn't in use, replace all lens covers to keep dust and contaminants off the optical surfaces.
2. A small amount of dust on any optical surface isn't a problem and doesn't need to be removed. If the dust builds
up, then use a can of compressed air and a camels hair brush to remove the dust. To remove fingerprints or other
contaminants, use an optical cleaning kit or the Celestron Lens Pen (#93575).
3. If the inside of the objective lens needs cleaning, it should be done by a professional. Either have your instrument
serviced by a telescope repair facility or return it to the factory for servicing.
2
60 telescope has a focal length of 700mm and comes with a 20mm 1¼" eyepiece. To calculate
Magnification =
PowerSeeker 60
Eyepiece
Magnification
20mm
35x
12.5mm
56x
4mm
175x
PowerSeeker 70
Eyepiece
Magnification
20mm
45x
12.5mm
72x
4mm
225x
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FL (telescope) in mm
FL (eyepiece) in mm
2
Mag. with 3x Barlow
Lens
105x
168x
525x
2
Mag. with 3x Barlow
Lens
135x
216x
675x
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