Celestron FIRSTSCOPE 60 EQ User Manual

ascension and decimation coordinates. Find the star and center it first in the fmderscope, then in the telescope.
Rotate the right ascension circle to match the coordinates of the star with the indicator mark.
The right ascension setting circle does not move as the telescope moves in right ascension, and thus it must be
aligned each time you want to use it to find a new object. However, you don’t need to use a bright star each time.
Instead, you can use the object you’re observing at the time.
Now, using a star chart or atlas, you can find numerous,objects. First, move the telescope in declination to the
correct declination coordinate. Then move the telescope in right ascension until the indicator points to the correct
coordinate.
After moving the telescope to the correct celestial coordinates, look through the fmderscope to see if you have
located the object you wish to view. Center the object in the fmderscope. Now look through the telescope with a
low power eyepiece, and the object should be in view.
Fainter objects may not be visible in the fmderscope. If this is the case, gradually pan the telescope, using the right
ascension and decimation cables, until the object is visible.
MAGNIFICATION
The magnification (or power) of a telescope varies dependmg upon the focal length of the eyepiece being used and
the focal length of the telescope.
The Firstscope 60 telescope has a focal length of 900mm and the Firstscope 60 EQ Deluxe comes with a 25mm 1 W
eyepiece. To calculate magnification, use the following formula, in which FL = focal length:
FL (telescope) in mm
Magnification ~ CT , . : “
* J rL (eyepiece) in mm
Therefore, if you use the 25mm eyepiece your magnification is 900/25 = 36x. The same formula can be applied to
any of your eyepieces.
Celestron offers numerous optional eyepieces to expand your range of magnification. Eyepieces come in barrel
diameters of .96" and VA". In general, VA" eyepieces are of a higher optical quality and give you sharper images,
along with a wider field of view and better eye relief.
Magnification through the telescope has its limits. These limits are determined by the laws of optics and the nature
of the human eye. The maximum usable power (with sharp images) is equal to 60 times the aperture of the
telescope (in inches). So, with a 60mm telescope it has a maximum useful power of 142x (2.3622" x 60) and with
the 70mm the maximum is 165x (2.7559 x 60). Most of your viewing will be done in the range of 30x to 120x.
Higher powers are used mainly for lunar and sometimes planetary observing where you can greatly enlarge the
image. The images at extremely high powers like 675x magnify the image bur remember that the contrast will be
very low and the image somewhat blurred due to the super power. For the brightest images with the most contrast,
use the lower powers with a smaller image scale.
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Celestron FIRSTSCOPE 60 EQ Specifications

General

Brand	Celestron
Model	FIRSTSCOPE 60 EQ
Category	Telescope
Language	English