Vixen Telescope VC200L User Manual

VC200L  
Telescope  
Vixen VC200L  
Design  
· The VC200L’s catadioptric optical system is  
one of the most sophisticated optical designs  
available on the market today. With its  
unique VISAC (Vixen Sixth-Order Aspheric  
Cassegrain) primary mirror, the optical  
system is composed of a concave primary  
mirror, a convex secondary mirror and a  
three-element field corrector. Especially  
noteworthy is its sharpness and flatness at  
the edge, which far exceeds that of Schmidt-  
Cassegrain systems of the same aperture. It  
provides a pinpoint star image of less than  
15 microns, even at the edge of its 42mm  
image circle. The open tube design eliminates  
the dew problem that is common with  
200mm/7.9” @ f/9  
Advanced Photo / Visual  
conventional Schmidt-Cassegrain systems  
and its size makes it very easy to handle.  
· The VC200L is well suited for observation and  
astrophotography of the moon, planets, star  
clusters, nebulae and comets. The rack-and-  
pinion focusing mount accepts optional 2”  
eyepieces and accessories, and an f/6.4  
reducer for photographic use is available.  
VISAC Solves Aberration  
Of the common catadioptric telescopes, only the VISAC  
system solves spherical, coma and curvature of field.  
Curvature  
of Field  
Reviews  
Telescope Types Spherical  
Coma  
“Owners comment that the VC200L yields flat,  
distortion-free images from edge to edge thanks  
to the corrector lens, while spherical aberration is  
minimized thanks to the aspheric primary mirror.  
The result is pinpoint stars from edge to edge, an  
important consideration for through-the-  
telescope photography.”  
Classical Cassegrain  
Dall-Kirkham  
Corrected  
Corrected  
Corrected  
Corrected  
L L  
L L  
Ritchy-Chretien  
Schmidt-Cassegrain  
V I S A C  
Corrected  
L
L L  
Corrected Corrected Corrected  
Star Ware, 3rd edition, pg.146  
“[C]atadioptric fans should take a close look at  
this scope, since it does offer a few advantages  
compared to your standard issue Schmidt-  
Cassegrain. … . The build quality is much better  
than most mass-produced SCTs. The Vixen has a  
2" rack and pinion focuser, which eliminates the  
primary image shift in an SCT. Also, the scope is  
collimatable to an impressive degree … . Finally,  
there's no corrector plate to collect dew.”  
VC200L Telescope Schematic Drawing  
Note special 3-element corrector in focus tube  
of this unique catadioptric design.  
Scopereviews.com, 12/16/2003  
Visit http://www.VixenAmerica.com or call us Mon. - Fri. from 9 a.m. - 5 p.m. ET: 845 469 8660  
Copyright © 2002-2004 Vixen North America, 32 Elkay Dr., Chester, NY 10918. All rights reserved.  
 

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