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infinity 90 мм
Инструкция по эксплуатации Страница: 15

Meade infinity 90 мм Инструкция по эксплуатации онлайн [15/20] 159827

times. The 9mm eyepiece magnifies objects

66.7 times.

If you obtain other eyepieces, you can calcu-

late how much magnification they have with

your telescope. Just divide the focal length

of the telescope by the focal length of the

eyepiece.

Focal Length of the Telescope

Focal Length of the Eyepiece

Magnification

Look at the specifications. For the Infinity

90, you will see that the focal length of this

scope is 600mm. 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 eye-

piece. Divide: 600 ÷ 13, which equals 46.15.

Round this off to the nearest whole number

and the new 13mm eyepiece magnifies

objects 46 times.

A great accessory for your telescope 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

For the Infinity 90 the 26mm low-power eye-

piece magnifies an object 23 times. Multiply

23 by 2 and you get 46 times magnification

with a Barlow.

It’s worth repeating: 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 magnifica-

tion value!

TAKING CARE OF YOUR TELESCOPE

Your telescope is a precision optical instru-

ment designed for a lifetime of reward-

ing 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).

Looking at or near the Sun will cause irreversible damage to your eye. Do not point this telescope at or near the Sun. Do not look through the telescope as it is moving.

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.

Meade infinity 90 мм Инструкция по эксплуатации онлайн [15/20] 159827

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