Celestron 71237 User manual

Conforms to and meets the

Transmission Requirements

of ISO 12312-2, Filters for

Direct Observation of the Sun

Instruction Manual

MODELS #71237, 71238

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Solar Binoculars

CELESTRON ECLIPSMART BINOCULARS

Thank you for your purchase of the Celestron EclipSmart binocular. We are conﬁdent it

will bring you many years of enjoyable solar observation. As this EclipSmart binocular

is a very specialized optical instrument, please read these instructions on its use and care

before using it.

IMPORTANT SAFETY NOTE: If done incorrectly, direct observation of the Sun

can be harmful to your vision. Never look directly at the Sun without using equipment

specially designed and tested for that purpose. Celestron’s EclipSmart binoculars

meet and conform to the ISO 12312-2 International Standard for safe direct visual

observation of the Sun. EclipSmart binoculars should not be used for solar observation

if the objective ﬁlters have been damaged, tampered with, or removed.

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Solar Binoculars

SET-UP AND USE OF YOUR CELESTRON ECLIPSMART BINOCULAR

Because of its built-in solar ﬁlters, nothing less bright than the sun as seen from Earth

should be able to be seen through an EclipSmart binocular. If you can see anything

other than the Sun through these binoculars, do not attempt solar viewing with them

and contact Celestron’s customer service department.

SET-UP

1. Adjusting the Interpupillary Distance (IPD)

Since the distance between the eyes (speciﬁcally,

the distance between the centers of the pupils)

varies among individuals, the two eyepieces of the

binoculars must be correctly aligned (adjusted).

This is called adjusting the interpupillary distance.

To adjust this distance, lift the binoculars up to your

eyes (using both hands) and move the two halves

of the binoculars by ﬂexing the hinge until both eyes

seem to be fully covered by the eyepieces.

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Solar Binoculars

2. Adjusting Diopter

EclipSmart binoculars feature a diopter

compensation adjustment mechanism on the right

eyepiece for sharpest focus. If you do not wish

to make an initial diopter correction adjustment,

simply check to make sure the indicator on the right

eyepiece is set to the “zero” mark prior to use.

3. Positioning the Rubber Eyecups

Leave the rubber eyecups up if you do not wear

eyeglasses, but fold them down if you do wear

eyeglasses to obtain the maximum ﬁeld of view.

Diopter

Adjustment Ring

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Solar Binoculars

1. Positioning the Binocular

Take up the binocular in both hands and with your view downward toward the ground

in front of you, turn your body so that you are facing the direction of the Sun. Place

the binocular eyecups in front of your eyes so that they are both completely covered.

Then, keeping the eyecups of the binocular squarely in front of your eyes, raise your

head until the solar disk appears in the binocular’s ﬁeld of view. If the solar disk is

not immediately apparent in the ﬁeld of view, slowly scan with the binocular until it

becomes apparent. AT NO TIME REMOVE THE ECLIPSMART BINOCULAR FROM

IN FRONT OF YOUR EYES WHILE YOUR GAZE IS DIRECTED TOWARD THE SUN.

USE

Unlike standard binoculars, in order to keep your eyes protected, proper use of

the EclipSmart binocular requires that you position your eyes behind the eyecups

BEFORE raising them into position to view the Sun.

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Solar Binoculars

2. Adjusting Focus

To focus your EclipSmart binocular, simply turn the

large dial located between the two barrels until a sharp

image of the solar disk is seen through the binocular.

3. Adjusting Diopter

With the EclipSmart binocular safely positioned in front

of your eyes and the solar disk in view, without moving the

binocular away from your eyes:

A. With both eyes open, use one hand to cover the right objective lens and then

adjust the center focus dial until the image seen through the left eyepiece is

satisfactorily sharp. Make no further adjustment to the center focus dial until this

process is complete.

B. Move your hand way from the right objective lens and cover the left objective lens.

If the image seen through the right eyepiece is satisfactorily sharp, you are ﬁnished.

If it is not, adjust the diopter correction dial on the right eyepiece until it is.

C. Move your hand away from the left objective lens and assess the image as seen

through both eyepieces simultaneously. The image should now be sharp and

satisfying to view.

Focus

Dial

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Solar Binoculars

ACTIVITIES WITH YOUR CELESTRON ECLIPSMART BINOCULAR

The Celestron EclipSmart binocular opens up the possibility of some amazing sky-

viewing adventures to you. After all, by using it in accordance with these instructions,

you can actually view the Sun!

THE GREAT AMERICAN SOLAR ECLIPSE OF 2017

On August 21, 2017, one of the greatest spectacles of our time will take place over

most of North America – a total solar eclipse. The Moon will pass between the Earth

and the Sun and the Moon’s shadow will trace a path directly across the United States

from coast to coast.

While solar eclipses happen at least twice a year, somewhere on Earth, the last time

there was a total solar eclipse over the USA was in 1979. At that time, the Sun just

grazed the states of Washington, Idaho and Montana. The August 2017 total solar

eclipse is expected to be the most watched celestial event in American history.

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Solar Binoculars

A total solar eclipse occurs when the Moon is close enough to Earth in its orbit so

that it blocks the entire disk of the Sun from view. The partial phases of a total solar

eclipse leading up to totality are incredible to watch. The Moon will ﬁrst appear as

a small dark dent in the edge of the Sun, growing to a large bite. If you are in the

path of totality, the Sun will eventually become a thin crescent and will disappear

completely. For a couple of minutes, daytime turns to deep twilight. Bright stars and

planets are visible in the daytime sky. After totality, the process reverses itself as the

Sun reemerges from behind the Moon. It is a sight that should not be missed.

How much of a given total solar eclipse you can see will depend greatly on where

you are located. The closer you are to the centerline of the path of the Moon’s

shadow, the greater the percentage of the Sun will be blocked and the longer the

solar eclipse will last. In order to experience totality, you need to be directly under

the Moon’s shadow. This path of totality is extremely narrow and for the 2017 total

solar eclipse the path is only 75 miles (120km) wide. If you are too far north or south

of the path of totality, you will only see a partial solar eclipse. Even if you are unable

to travel to the path of totality, everyone in the continental United States and most

of Canada will be treated to a partial solar eclipse with at least 60% of the Sun

covered by the Moon.

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Solar Binoculars

Now that you have a Celestron EclipSmart binocular to provide you a full view with

both eyes at 10x magniﬁcation – the optimal way to view such an event - you are

ready to be part of history.

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Solar Binoculars

SUNSPOTS

Sunspots are dark spots that appear on the photosphere, or visible “surface” of the

Sun. They usually have a dark core, called the umbra, surrounded by a lighter border,

called the penumbra. They form when large disturbances in the Sun’s magnetic ﬁeld

cool portions of the photosphere. Sunspots are relatively cool, being only 6000°F

(3300°C) compared to the normal 10,000°F (5500°C) of the rest of the photosphere.

Although these spots appear to be almost black, they are actually quite bright. If it were

possible to remove a sunspot from the Sun and put it in the night sky, it would shine

brighter than the full moon. They only appears to be “dark” when compared to the rest

of the photosphere.

Sunspots can be big. Very big. They can range in size from 10 to 100,000 miles (16

to 160,000 km) in diameter. To put that into perspective, the Earth is only 8,000 miles

(12,800 km) in diameter!

Sunspots usually appear in pairs but can also appear in very large groups. They can last

from a few days to several weeks and can change their shape, size and number as they

slowly rotate across the face of the Sun. It will take about two weeks for a sunspot group

to cross the Sun. Try looking at the Sun every day and draw a picture of what you see. At

the end of the week, compare your drawings and you’ll see how sunspots evolve.

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