Celestron PowerSeeker 21041 Buku Petunjuk - Halaman 6
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The PowerSeeker telescope has a focal length of 700mm and comes with a 20mm 1¼" eyepiece. To calculate
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 1.5x
erecting eyepiece or 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.
Magnification =
Eyepiece
Magnification
20mm
35x
4mm
175x
T
E
L
E
T
E
L
E
Aperture
Focal Length
Focal Ratio
Mounting
Tripod
NOTE: Specifications are subject to change without notice.
FL (telescope) in mm
FL (eyepiece) in mm
Mag. with 1.5x
Erecting Eyepiece
53x
263x
S
C
O
P
E
M
A
I
N
T
E
N
S
C
O
P
E
M
A
I
N
T
E
N
S
P
E
C
I
F
I
C
A
T
I
O
N
S
S
P
E
C
I
F
I
C
A
T
I
O
N
S
PowerSeeker 60's
60mm
700mm
f/12
Altazimuth
Adjustable Aluminum Tripod
6
Mag. with 3x Barlow
Lens
105x
525x
A
N
C
E
A
N
C
E