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VC200L
image circle. The open tube design eliminates
ited for observation and
to the corrector lens, while spherical aberration is
Vixen VC200L
200mm/7.9” @ f/9
Advanced Photo / Visual
VISAC Solves Aberration
Of the common catadioptric telescopes, only the VISAC
system solves spherical, coma and curvature of field.
Telescope Types Spherical Coma
Classical Cassegrain Corrected
Dall-Kirkham Corrected
Ritchy-Chretien Corrected Corrected
Schmidt-Cassegrain Corrected
V I S A C Corrected Corrected Corrected
VC200L Telescope Schematic Drawing
Note special 3-element corrector in focus tube
of this unique catadioptric design.
L L
L L
L L
Curvature
of Field
L
Telescope
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 SchmidtCassegrain systems of the same aperture. It
provides a pinpoint star image of less than
15 microns, even at the edge of its 42mm
the dew problem that is common with
conventional Schmidt-Cassegrain systems
and its size makes it very easy to handle.
• The VC200L is well su
astrophotography of the moon, planets, star
clusters, nebulae and comets. The rack-andpinion focusing mount accepts optional 2”
eyepieces and accessories, and an f/6.4
reducer for photographic use is available.
Reviews
“Owners comment that the VC200L yields flat,
distortion-free images from edge to edge thanks
minimized thanks to the aspheric primary mirror.
The result is pinpoint stars from edge to edge, an
important consideration for through-thetelescope photography.”
— 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 SchmidtCassegrain. … . 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.”
— Scopereviews.com, 12/16/2003
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Copyright © 2002-2004 Vixen North America, 32 Elkay Dr., Chester, NY 10918. All rights reserved.
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