Celestron NexStar HC - Manual (Page 36)

36
You will find that additional accessories enhance your viewing pleasure and expand the usefulness of your telescope. For
ease of reference, all the accessories are listed in alphabetical order.
Adapter, AC (#18770) – Allows DC (battery) powered telescopes to be converted for use with 120 volt AC power. The
adapter attaches to any standard wall outlet.
Adapter, Car Battery (#18769) -
Celestron offers the Car Battery Adapter that allows you to run the NexStar drive off
an external power source. The adapter attaches to the cigarette lighter of your car,
truck, van, or motorcycle.
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 NexStar. 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.
Carrying Case (#302080) - This case fits both the NexStar 4 and NexStar 5 and is made of sturdy ABS plastic. It is
completely lined with pick-n-pluck foam for a customized and secure fit to safely transport and store your scope and
accessories..
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: 11/4"
The SMA design is an improved version of the Kellner eyepiece. SMA's 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 1-1/4" sizes 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: 3.6mm, 6mm, 8mm, 10mm, 13mm, 17mm, 25mm, 32mm and 40mm.
• Ultima - Ultima is not really a design, but a trade name for our 5-element, wide
field eyepieces. In the 1-1/4" barrel diameter, they are available in the following
focal lengths: 5mm, 7.5mm, 12.5mm, 18mm, 30mm, 35mm, and 42mm. These
eyepieces are all parfocal. The 35mm Ultima gives the widest possible field of
view with a 1-1/4" diagonal .
•
Lanthanum Eyepieces (LV Series) - Lanthanum is a unique rare earth glass used
in one of the field lenses of this new eyepiece. The Lanthanum glass reduces
aberrations to a minimum. All are fully multicoated and have an astounding 20mm
of eye relief — perfect for eyeglass wearers! In the 1-1/4" barrel diameter, they are
available in the following focal lengths: 2.5mm, 4mm, 5mm, 6mm, 9mm, 10mm,
12mm and 15mm. Celestron also offers the LV Zoom eyepiece (#3777) with a focal
length of 8mm to 24mm. It offers an apparent field of 40º at 24mm and 60º at 8mm.
Eye relief ranges from 15mm to 19mm
.