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62 • Celestial Photography
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Planetary or Lunar--
f/20 is a great way to image the planets and features on the moon. With the
PixCel CCD camera and optional Color Filter Wheel, it is easy to take tri-color
images of planets also. When imaging the planets, very short exposures are
needed. Many cameras have trouble taking images under .1 seconds. The
PixCel camera can image at .01 seconds exposures due to the design of the
CCD array. The exposure lengths range from .03 to .1 seconds on planetary
images. Focus is critical as is good atmospheric conditions. Generally you
will take one image after another until one looks good (see AutoGrab feature in
the PixCel Operating Manual). This is due to the atmospheric “seeing” condi-
tions. For every 10 exposures you might save 1. To image at f/22 you need to
purchase a 2x Barlow and a T-adapter or Radial Guider.
1 Optical Tube Assembly 13 Radial Guider
2 Secondary Mirror 14 Microguide Eyepiece
3 Secondary Mirror Retaining Ring 15 Illuminator (Microguide Eyepiece only)
4 Fastar Lens Spacer 16 Pulstar Illuminator
5 Fastar Spacer Retaining Ring 17 Visual Back 1 ¼”
6 Fastar Lens Assembly 18 Star Diagonal
7 Tricolor Spacer Ring 19 2X Barlow Lens
8 Fastar 14 T-Adapter 20 Cross Hair Eyepiece
9 IR Cutoff Filter 21 26mm Plossl Eyepiece
10 PixCel CCD Camera 22 T-Ring
11 Reducer/Corrector f/6.3 23 T - 1
1
/
4
" Adapter
12 T-Adapter 24 35mm SLR Camera
Imaging at f/22
Figure 7-6 -- This diagram shows the many accessories that can be used with the Fastar compatible
CM-14 telescope in its various optical configurations.