Product Details
Vixen's unique VISAC catadioptric design consists of a precision sixth order aspherical primary mirror, a convex secondary mirror and a triplet corrector lens, providing an exceptionally flat field and outstanding photographic performance.
VISAC achieves a photographic field virtually free of aberration, with coma, spherical aberration and field curvature perfectly corrected by the triplet lens. This yields star images of less than 15 microns across, edge to edge of a 42mm image circle - outperforming flourite triplets, Dall-Kirkhams and even Ritchey-Chretien optics.
The open-fronted design of the Vixen catadioptics considerably speeds up cooling. The VC200L works fantastically as either a visual tube or as an astrograph for serious astrophotographers.
This tube comes with a standard dovetail for mounting to either a Vixen SX mount or any equivalent. It's very hard to find a tube of this quality at a similar price point from any other manufacturer.
Specification
OPTICAL DESIGN Vixen 6th-order Aspherical Catadioptric
APERTURE DIAMETER 200mm (7.87in)
FOCAL LENGTH 1800mm (70.87in)
FOCAL RATIO 9.0
FINDERSCOPE 7x50 Finderscope
STAR DIAGONAL Vixen Flip-Mirror diagonal
MOUNTING INTERFACE Standard dovetail
MOUNT TYPE Not included
OPTICAL TUBE MATERIAL Metal
OPTICAL COATINGS Multi-coated
EYEPIECE FOCAL LENGTH Not included
EYEPIECE BARREL SIZE 31.7mm (1.25") with supplied flip-mirror diagonal
HIGHEST USEFUL MAGNIFICATION 400x
LOWEST USEFUL MAGNIFICATION 36x
LIMITING STELLAR MAGNITUDE 13.3
RESOLUTION 0.58 arcseconds
LIGHT GATHERING POWER 816x
FOCUSER TYPE 50.8mm (2") rear-mounted precision rack & pinion focuser
OPTICAL TUBE LENGTH 620mm (24.41in)
OPTICAL TUBE WEIGHT 6.0kg (13.2lb)
WARRANTY 1 year
