Optional Accessories • 55
Single Axis Motor Drive System - #93518
By adding the MDCG-5 Drive System to your mount, you add the capacity to
automatically
track objects in the sky, a convenience you’ll be sure to enjoy
during long viewing or astrophotography sessions, when manual tracking can
become tiring. Furthermore, the Drive System will enhance high-power visual
observing. It attaches to the R.A. (east/west) drive axis of your CG-5 Mount
and will drive the telescope at the normal sidereal rate as well as allowing you
to guide at 2x and 4x sidereal. Power is supplied via a DC battery pack.
Planisphere (93720) - A simple and inexpensive tool for all levels of observers,
from naked eye viewers to users of highly sophisticated telescopes. The
Celestron Planisphere makes it easy to locate stars for observing and is a
great planet finder as well. A map of the night sky, oriented by month and day,
rotates within a depiction of the 24 hours of the day, to display exactly which
stars and planets will be visible at any given time. Ingeniously simple to use,
yet quite effective. Made of durable materials and coated for added
protection. Celestron Planispheres come in three different models, to match
the latitude from which you’re observing:
For 20
° to 40° of latitude #93720-30
For 30° to 50° of latitude #93720-40
For 40° to 60° of latitude #93720-50
Polarizing Filter Set (#93608) - The polarizing filter set limits the transmis-
sion of light to a specific plane, thus increasing contrast between various
objects. This is used primarily for terrestrial, lunar and planetary observing.
Polar Axis Finderscope (#94221) - This useful accessory speeds accurate
polar alignment by providing a means of visually aligning your German equato-
rial mount with Polaris and true north. The finderscope has an eyepiece with
etched reticle for quick polar alignment.
Radial Guider (#94176) - The Celestron
®
Radial Guider is specifically de-
signed for use in prime focus, deep sky astrophotography and takes the place
of the T-Adapter. This device allows you to photograph and guide simulta-
neously through the optical tube assembly of your telescope. This type of
guiding produces the best results since what you see through the guiding
eyepiece is exactly reproduced on the processed film. The Radial Guider is a
“T”-shaped assembly that attaches to the rear cell of the telescope. As light
from the telescope enters the guider, most passes straight through to the
camera. A small portion, however, is diverted by a prism at an adjustable
angle up to the guiding eyepiece. This guider has two features not found on
other off-axis guiders; first, the prism and eyepiece housing rotate indepen-
dently of the camera orientation making the acquisition of a guide star quite
easy. Second, the prism angle is tunable allowing you to look at guide stars
on-axis. This accessory works especially well with the Reducer/Corrector.
Reducer/Corrector (#94175) - This lens reduces the focal length of the
telescope by 37%, making your G-9
1
/
4
a 1481mm f/6.3 instrument. In addi-
tion, this unique lens also corrects inherent aberrations to produce crisp
images all the way across the field when used visually. When used photo-
graphically, there is some vignetting that produces a 26mm circular image on
the processed film. It also increases the field of view significantly and is ideal
for wide-field, deep-space viewing. It is also perfect for beginning prime focus,
long-exposure astrophotography when used with the Radial Guider. It makes
To Next Page