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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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.