Celestial Photography • 53
Fastar Lens Assembly Option – Using your G-8 telescope at f/1.95
with optional PixCel CCD Camera
Your G-8 telescope is equipped with a removable secondary mirror that allows you
to convert your f/10 telescope into an f/1.95 imaging system capable of exposure
times 25 times shorter than those needed with a f/10 system! Used with
Celestron’s PixCel CCD System, objects will be easily found due to the ultra wide
2/3° by 1/2° field of view provided. With the optional Fastar lens assembly you can
easily convert your Fastar compatible telescope to f/1.95 prime focus use in a
matter of seconds. Your telescope can now be used in many different f-number’s
for CCD imaging. It can be used at f/1.95 (with optional Fastar Lens Assembly –
#94180), f/6.3 (with the optional Reducer/Corrector– #94175), f/10, and f/20 (with
the optional 2x barlow – #93507) making it the most versatile imaging system
available today. This makes the system ideal for imaging deep-sky objects as well
as planetary detail. The key to the Fastar’s versatility is the variety of different F-
numbers in which it can be used. Described below is the significance of each F-
number and the type of object best suited to that kind of imaging.
Figure 7-1
The above figure shows how the secondary mirror is removed when using the
optional PixCel CCD camera at f/1.95 and the Fastar Lens Assembly (#94180).
Warning:
The secondary mirror should never be removed unless installing the
optional Fastar Lens Assembly. Adjustments to collimation can easily be
made by turning the screws on the top of the secondary mirror mount without
ever having to remove the secondary mirror (see Telescope Maintenance
section of this manual).
CCD IMAGING
Secondary
Mirror
Secondary
Mirror
Retaining Ring
Corrector Plate
Secondary
Mirror Mount
Handle
