7
the field of view. Before you can use the cables, you must
manually “slew” the mount to point the telescope in the vicinity
of the desired target. Do this by loosening the R.A. and Dec.
lock knobs and moving the telescope about the mount’s R.A.
and Dec. axes. Once the telescope is pointed somewhere
close to the object to be viewed, retighten the mount’s R.A.
and Dec. lock knobs.
The object should now be visible somewhere in the EZ Finder
II. If it isn’t, use the slow-motion controls to scan the surround-
ing area of sky. When the object is visible in the EZ Finder II,
use the slow-motion controls to center it on the red dot. Now,
look in the telescope’s eyepiece. If the EZ Finder II is properly
aligned, the object should be visible somewhere in the field of
view. Once the object is visible in the eyepiece, use the slow-
motion controls to center it in the field of view.
The Dec. slow-motion control cable can move the telescope a
maximum of 25°. This is because the Dec. slow-motion mech-
anism has a limited range of mechanical travel. (The R.A.
slow-motion mechanism has no limit to its amount of travel). If
you can no longer rotate the Dec. control cable in a desired
direction, you have reached the end of travel, and the slow-
motion mechanism must be reset. This is done by first rotating
the control cable several turns in the opposite direction from
which it was originally being turned. Then, manually slew the
telescope closer to the object you wish to observe (remember
to first loosen the Dec. lock knob). You should now be able to
use the Dec. slow-motion control cable again to finely adjust
the telescope’s position.
Tracking Celestial Objects
When you observe a celestial object through the telescope,
you’ll see it drift slowly across the field of view. To keep it in the
field, if your equatorial mount is polar aligned, just turn the
R.A. slow-motion control cable clockwise. The Dec. slow-
motion control cable is not needed for tracking. Objects will
appear to move faster at higher magnifications, because the
field of view is narrower.
Optional Electronic Drives for Automatic
Tracking
An optional DC electronic drive can be mounted on the R.A.
axis of the equatorial mount to provide hands-free tracking.
Objects will then remain stationary in the field of view without
any manual adjustment of the R.A. slow-motion control cable.
Understanding the Setting Circles
The setting circles on an equatorial mount enable you to
locate celestial objects by their “celestial coordinates”. Every
object resides in a specific location on the “celestial sphere”.
That location is denoted by two numbers: its right ascension
(R.A.) and declination (Dec.). In the same way, every location
on Earth can be described by its longitude and latitude. R.A. is
similar to longitude on Earth, and Dec. is similar to latitude.
The R.A. and Dec. values for celestial objects can be found in
any star atlas or star catalog.
The mount’s R.A. setting circle is scaled in hours, from 1
through 24, with small marks in between representing 10-min-
ute increments. The numbers closest to the R.A. axis gear
apply to viewing in the Southern Hemisphere, while the num-
bers above them apply to viewing in the Northern
Hemisphere.
The Dec. setting circle is scaled in degrees, with each mark
representing 2.5° increments. Values of Dec. coordinates
range from +90° to -90°. The 0° mark indicates the celestial
equator. When the telescope is pointed north of the celestial
equator, values of the Dec. setting circle are positive, while
when the telescope is pointed south of the celestial equator,
values of the Dec. setting circle are negative.
So, the coordinates for the Orion Nebula listed in a star atlas
will look like this:
R.A. 5h 35.4m Dec. -5° 27’
That’s 5 hours and 35.4 minutes in right ascension, and -5
degrees and 27 arc-minutes in declination (there are 60 arc-
minutes in 1 degree of declination).
Before you can use the setting circles to locate objects, the
mount must be correctly polar aligned, and the R.A. setting
circle must be calibrated.The Dec. setting circle has been per-
manently calibrated at the factory, and should read 90°
whenever the telescope optical tube is parallel with the R.A.
axis.
Calibrating the Right Ascension Setting Circle
1. Identify a bright star in the sky near the celestial equator
(Dec. = 0°) and look up its coordinates in a star atlas.
2. Loosen the R.A. and Dec. lock knobs on the equatorial
mount, so the telescope optical tube can move freely.
3. Point the telescope at the bright star whose coordinates
you know. Lock the R.A. and Dec. lock knobs. Center the
star in the telescope’s field of view with the slow-motion
control cables.
4. Rotate the setting circle until the metal arrow indicates the
R.A. coordinate listed in the star atlas for the object.
Finding Objects With the Setting Circles
Now that both setting circles are calibrated, look up in a star
atlas the coordinates of an object you wish to view.
1. Loosen the Dec. lock knob and rotate the telescope until
the Dec. value from the star atlas matches the reading on
the Dec. setting circle. Remember that values of the Dec.
setting circle are positive when the telescope is pointing
north of the celestial equator (Dec. = 0°), and negative
when the telescope is pointing south of the celestial equa-
tor. Retighten the lock knob.
2. Loosen the R.A. lock knob and rotate the telescope until
the R.A. value from the star atlas matches the reading on
the R.A. setting circle. Remember to use the upper set of
numbers on the R.A. setting circle. Retighten the lock
knob.
Most setting circles are not accurate enough to put an object
dead-center in the telescope’s eyepiece, but they should place
the object somewhere within the field of view of the EZ Finder
II, assuming the equatorial mount is accurately polar aligned.
