Celestron 71212 Manual De Instrucciones

R
eticle and
#71212
I M
nstructIon anual
a F
djustIng ocus
To obtain a sharp view through your monocular, you
need to adjust the focus. Rotate the focus wheel
until you have a sharp image. Hint: Eyeglasses worn
for nearsightedness should be worn when using
monoculars, as you may not be able to reach a
sharp focus at infinity without them.
s r e
et the ubber yecup
To obtain the maximum field of view, keep the
rubber eyecup up if you do not wear eyeglasses
and fold it down if you do wear eyeglasses.
u r
sIng the etIcle as a
V A
iew ngle
View Angle of an object is the angle between the rays from the monocular
to its edges. Usually, this angle is measured at the horizontal or vertical
direction and defined as Horizontal View Angle and Vertical View Angle.
A mil's reticle (shown to the right) that has a horizontal and vertical scale
can measure the viewing angle of an object. The Celestron monocular
uses 10 mils for each number (1,2,3,... as shown here).
M h
eAsuring the orizontAl
When the Horizontal View Angle is smaller than the horizontal scale range
(-40~+40 mils) inside the monocular, aim one edge of the object at a
horizontal scale line (the center or the outmost line is selected according to
the image size of the object usually) and read its value. Then read the value
of the scale at which another edge was located. Add these two values, this
gives you the measured Horizontal View Angle. As shown in Figure 3, the
Horizontal View Angle of the target (sailboat) is 2 decade mils (20 mils), and
the Horizontal View Angle between the targets is 8 decade mils (80mils).
When the Horizontal View Angle is larger than the horizontal scale range
(-40~+40 mils), vertical line splits (for example: mast, sail, etc.) on the object
can be selected to make the necessary estimated measurements in a step by
step fashion.
M V
eAsuring the erticAl
Vertical View Angle measurement is similar to measuring the Horizontal
View Angle. When the Vertical View Angle measurement is small, aim the
intersecting point of the vertical and horizontal lines of the reticle at the
lower part of the object and read the scale value at the top of the object.
As shown in Figure 4, the angle included between the upper and lower
parts of the target (lighthouse) is 6 decade mils (60mils).
When the Vertical View Angle is larger than the vertical scale range (80 mils),
it can be measured in steps and the angle can be obtained by summing up
the value of each step.
c m
ompass onoculaR
–
English
M d
easurIng evIce
V A
iew ngle
V A
iew ngle
T
hank you for purchasing a
. W
monocular e hope iT brings you many
years of enjoymenT
use of This monocular
insTrucTions carefully before using
o l
bjectIve ens
c
elesTron
. T
o maximize your
,
please read These
.
F 1
Igure
F W
ocus
e (
yecup eyepIece under
F 2
Igure
F 3
Igure
F 4
Igure
heel
)