Celestron CR-150 HD User Manual
Page 51
Optional Accessories • 51
•
Lanthanum Eyepieces (LV Series) - Lanthanum is a unique rare earth
glass used in one of the field lenses of this new eyepiece. The Lantha-
num glass reduces aberrations to a minimum. All are fully multicoated
and have an astounding 20mm of eye relief — perfect for eyeglass
wearers! 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 40
o
at 24mm and 60
o
at
8mm. Eye relief ranges from 15mm to 19mm.
Eyepiece Filters - To enhance your visual
observations of solar system objects,
Celestron offers a wide range of colored filters
that thread into the 1-1/4" oculars. Available
individually are: #12 deep yellow, #21 orange,
#25 red, #58 green, #80A light blue, #96
neutral density - 25%T, #96 neutral density -
13%T, and polarizing. These and other filters
are also sold in sets.
Finderscopes - Finderscopes are used to help you locate objects in the main
telescope. The larger the finder, the more you will see, making it easier to
locate objects. One option for finders is the illuminated Polaris 7x50 Finder
(#93785-8P). Another tool for finding objects in the sky is the Star Pointer
(#51630). The Star Pointer is different from a finderscope in that you can use
both eyes when pointing the telescope at an object. A partially reflective
surface projects the image of an LED illuminated pinpoint into the line of sight.
Just align the illuminated pinpoint with the object you are interested in and the
object will be in the main telescope.
Night Vision Flashlight - (#93588) - Celestron’s premium model for as-
tronomy, using two red LEDs 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) Filters - The 1 1/4" eyepiece filter is
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 lights. This
includes mercury and high and low pressure sodium vapor lights. In addition, it
also block unwanted natural light (sky glow) caused by neutral oxygen emis-
sion in our atmosphere.
Micro Guide Eyepiece (#94171) - This multipurpose 12.5mm illuminated
reticle can be used for guiding deep-sky astrophotos, measuring position
angles, angular separations, and more. The laser etched reticle provides razor
sharp lines and the variable brightness illuminator is completely cordless. The
micro guide eyepiece produces 96 power when used with the CR-150 HD at f/
8.
Moon Filter (94119-A) - Celestron’s Moon Filter is an economical eyepiece
filter for reducing the brightness of the moon and improving contrast, so
greater detail can be observed on the lunar surface. The clear aperture is
21mm and the transmission is about 18%.