Celestron NexStar 8 Instruction Manual page 41

Radial Guider (#94176) - The Celestron Radial Guider ® is specifically designed for use
in prime focus, deep sky stro photography and takes the place of the T-Adapter. This
device allows you to photograph and guide simultaneously 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 independently 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.
night sky. You wouldn't set off on a road trip without a road map, and you don't need to try to navigate the night sky
without a map either. Even if you already know your way around the major constellations, these maps can help you locate
all kinds of fascinating objects.
Skylight Filter (#93621) - The Skylight Filter is used on the Celestron NexStar telescope as a dust seal. The filter threads
onto the rear cell of your telescope. All other accessories, both visual and photographic (with the exception of Barlow
lenses), thread onto the skylight filter. The light loss caused by this filter is minimal.
Solar Filter (#94162) - The AstroSolar® filter is a safe and durable filter that covers the front opening of the telescope.
View sunspots and other solar features using this double-sided metal coated filter for
uniform density and good color balance across the entire field. The Sun offers constant
changes and will keep your observing interesting and fun.
T-Adapter (#93633-A) - T-Adapter (with additional T-Ring) allows you to attach your
SLR camera to the rear cell of your Celestron NexStar. This turns your NexStar into
2000mm telephoto lens perfect for terrestrial photography and short exposure lunar and
.
filtered solar photography
T-Ring - The T-Ring couples your 35mm SLR camera body to the T-Adapter, radial guider,
or tele-extender. This accessory is mandatory if you want to do photography through the
telescope. Each camera make (i.e., Minolta, Nikon, Pentax, etc.) has its own unique mount
and therefore, its own T-Ring. Celestron has 8 different models for 35mm cameras.
Tele-Extender, Deluxe (#93643) - The tele-extender is a hollow tube that allows you to attach a camera to the telescope
when the eyepiece is installed. This accessory is used for eyepiece projection photography which allows you to capture very
high power views of the Sun, Moon, and planets on film. The tele-extender fits over the eyepiece onto the visual back. This
tele-extender works with eyepieces that have large housings, like the Celestron Ultima series.
Vibration Suppression Pads (#93503) - These pads rest between the ground and tripod feet of your telescope. They reduce
the amplitude and vibration time of your telescope when shaken by the wind or an accidental bump. This accessory is a
must for long exposure prime focus photography.
Wedge, NexStar – The wedge allows you to tilt the telescope so that its polar axis is parallel to the earth's axis of rotation.
Ideal for using your NexStar for guided astro photography.
A full description of all Celestron accessories can be found in the Celestron Accessory Catalog (#93685).
Reducer/Corrector (#94175) - This lens reduces the focal length of the telescope by
37%, making your NexStar a 787.5mm f/6.3 instrument. In addition, this unique lens also
corrects inherent aberrations to produce crisp images all the way across the field when
used visually. When used photographically, there is some vignetting that produces a
26mm circular image on the processed film.
significantly and is ideal for wide-field, deep-space viewing.
beginning prime focus, long-exposure astro photography when used with the radial
guider. It makes guiding easier and exposures much shorter.
s
Sky Map (#93722) - Celestron Sky Maps are the ideal teaching guide for learning the
It also increases the field of view
a
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It is also perfect for