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Optional Accessories • 53
OPTIONAL ACCESSORIES
The following is a partial list of optional accessories available for your Celestron
C150-HD and G-8N.
Barlow Lens - A Barlow lens is a negative lens that increases the focal length
of a telescope. Used with any eyepiece, it doubles the magnification of that
eyepiece. Celestron offers two Barlow lens in the 1-1/4" size for the C150-HD
and G-8N. The 2x Ultima Barlow (#93506) is a compact triplet design that is
fully multicoated for maximum light transmission and parfocal when used with
the Ultima eyepieces. Model #93507 is a compact achromatic Barlow lens that
is under three inches long and weighs only 4 oz. It works very well with all
Celestron eyepieces.
CD-ROM (93700) - Celestron and Software Bisque have joined together to
present this comprehensive CD-ROM called
The Sky™ Level 1 - for Celestron.
It features a 10,000 object database, 75 color images, horizontal projection,
custom sky chart printing, zoom capability, Comet Hale-Bopp coordinates and
more! A fun, useful and educational product. PC format.
Dual Axis Drive System - #93523
This drive motor, with drive corrector capabilities, is designed for Celestron’s
CG-5 Equatorial telescope mount. It precisely controls the telescope’s
tracking speed during long, timed exposures of celestial objects, producing the
best possible image sharpness. Drive correctors are a must for those with
serious interest in astrophotography or CCD imaging.This precision, state-of-
the-art DC motor drive operates on D-Cell batteries. The hand controller
module is very compact and fits easily in the palm of your hand. Motors for
both axes are included, along with brackets, clutches and hardware.
Eyepieces - Like telescopes, eyepieces come in a variety of designs. Each
design has its own advantages and disadvantages. For the 1-1/4" barrel
diameter there are four different eyepiece designs available.
• Super Modified Achromatic (SMA) Eyepieces:
The SMA design is an improved version of the Kellner eyepiece. SMAs
are very good, economical, general purpose eyepieces that deliver a
wide apparent field, good color correction and an excellent image at the
center of the field of view. Celestron offers SMA eyepieces in the following
focal lengths: 6mm, 10mm, 12mm,17mm and 25mm.
• Plössl - Plössl eyepieces have a 4-element lens designed for low-to-high
power observing. The Plössls offer razor sharp views across the entire
field, even at the edges! In the 1-1/4" barrel diameter, they are available in
the following focal lengths: 6.3mm, 7.5mm, 10mm, 12.5mm, 17mm,
20mm, 26mm, 32mm and 40mm.
• Ultima - Ultima is not really a design, but a trade name for our 5-element,
wide field eyepieces. They are available in the following focal lengths:
5mm, 7.5mm, 12.5mm, 18mm, 24mm, 30mm, 35mm, and 42mm. These
eyepieces are all parfocal.