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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, 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.
Diagonal, 45 degree, erect image (#94116) – Threads on to the back of the NexStar 4. This design allows you to look into the telescope at a
45° angle, at images that are oriented properly, meaning the image is upright and correct from left to right.
Eyepieces - Like telescopes, eyepieces come in a variety of designs. Each design has its own advantages. For the 1-1/4" barrel diameter
there are three different eyepiece designs available:
• OMNI 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: 4mm, 6mm, 9mm, 12.5mm, 15mm, 20mm, 25mm, 32mm and 40mm.
• X-Cel - This 6 element design allows each X-Cel Eyepiece to have 20mm of eye
relief, 55° field of view and more than 25mm of lens aperture (even with the 2.3mm).
In order to maintain razor sharp, color corrected images across its 50° field of view,
extra-low dispersion glass is used for the most highly curved optical elements. The
excellent refractive properties of these high grade optical elements, make the X-Cel
line especially well suited for high magnification planetary viewing where sharp,
color-free views are most appreciated. X-Cel eyepieces come in the following focal
lengths: 2.3mm, 5mm, 8mm, 10mm, 12.5mm, 18mm, 21mm, 25mm.
• 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, 10mm 12.5mm, 18mm,
30mm, 35mm, and 42mm. These eyepieces are all parfocal.
Exotherm, Hand Warmer- (#93504) - Perfect for chilly evenings of star gazing, the Exotherm Hand Warmer is convenient, reusable and
provides up to one hour of instant heat.
Filters, Eyepiece - To enhance your visual observations of solar system objects, Celestron offers a wide range of colored eyepiece filter sets
that thread into the 1-1/4" oculars. Available sets are:
#94119-10 – Orange, Light Blue, ND13%T, Polarizing (#s 21, 80A, 15, Polarizing)
#94119-20 - Deep Yellow, Red, Light Green, ND25% T (#s 12, 25, 56, 96ND-25)
#94119-30 - Light Red, Blue, Green, ND50% T (#s 23A, 38A, 58, 96ND-50)
#94119-40 - Yellow, Deep Yellow, Violet, Pale Blue (#s 8, 96ND-13, 47, 82A)
Night Vision Flashlight - (#93588) - Celestron’s premium model for astronomy, using two red LED's to preserve night vision better than red
filters or other devices. Brightness is adjustable. Operates on a single 9 volt battery (included).
Light Pollution Reduction (LPR) Filter - These filters are designed to enhance your views of deep sky astronomical objects when viewed
from urban areas. LPR Filters selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial
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