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Let’s say that you have obtained a 13mm
eyepiece. You can tell that what the focal
length of your eyepiece is as it is always
printed on the side of an eyepiece. Divide:
700 ÷ 13, which equals 53.8. Round this off
to the nearest whole number and your new
eyepiece magnifies objects 54 times.
A great optional accessory is a Barlow lens
If you use a Barlow lens with one of your
eyepieces, it doubles the magnification
of your eyepiece. Other types of Barlows
can triple or further increase the power
of an eyepiece. To find out how much the
magnification is when you use a Barlow,
multiply your eyepiece’s magnification
by two.
Eyepiece’s magnification x 2
=
Magnification with a 2X Barlow lens
Your 25mm low-power eyepiece magnifies
an object 28 times. Multiply 28 by 2 and you
get 56 times magnification with a Barlow.
IItt’’ss wwoorrtthh rreeppeeaattiinngg::
Keep in mind that a
bright, clear, but smaller image is more
interesting than a larger, dimmer, fuzzy one.
Using too high a power eyepiece is one of
the most common mistakes made by new
astronomers. So don’t think that higher
magnification is necessarily better—quite
often the best view is with lower
magnification value!
TAKING CARE OF YOUR TELESCOPE
Your telescope is a precision optical
instrument designed for a lifetime of
rewarding viewing. It will rarely, if ever,
require factory servicing or maintenance.
Follow these guidelines to keep your
telescope in the best condition:
• Avoid cleaning the telescope’s lenses. A
little dust on the front surface of the
telescope’s correcting lens will not cause
loss of image quality.
• When absolutely necessary, dust on the
front lens should be removed with very
gentle strokes of a camel hair brush or
blown off with an ear syringe (available at
most pharmacies).
• Fingerprints and organic materials on the
front lens may be removed with a solution
JOIN AN ASTRONOMY CLUB, ATTEND A STAR PARTY
One of the best ways to increase your knowledge of
astronomy is to join an astronomy club. Check your
local newspaper, school, library, or telescope dealer/
store to find out if there’s a club in your area.
Many groups also hold regularly scheduled Star
Parties at which you can check out and observe with
many different telescopes and other pieces of
astronomical equipment. Magazines such as
Sky and
Telescope
and
Astronomy
print schedules for many
popular Star Parties around the United States and
Canada.
of 3 parts distilled water to 1 part
isopropyl alcohol. You may also add
1 drop of biodegradable dishwashing
soap per pint of solution. Use soft,
white facial tissues and make short,
gentle strokes. Change tissues often.
CAUTION: Do not use scented or lotioned
tissues or damage could result to the
optics. DO NOT use a commercial
photographic lens cleaner.
OPTIONAL ACCESSORIES
#928 45° Erecting Prism (1.25 O.D.):
Correctly orients the telescopic image
13
Looking at or near the Sunwill cause irreversibledamage to your eye. Do not point this telescope at or near the Sun. Do not look through the telescope as it is moving.
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