Vixen VSD 100 f3.8 Flat Field Refractor
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Vixen VSD 100 f3.8 Flat Field Refractor

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About this product

Model:  vixen_sd100f3.8

The new Japanese-made Vixen VSD100 f3.8 telescope features an innovative 5 element lens design with an SD lens in the front objective group and an ED lens in the rear group for a large, flat, evenly illuminated field with superb colour correction. The blue halos around stars that are perceptible in simpler designs are completely absent. In addition, astigmatism and coma aberrations are corrected to a very high level. 

See this remarkable APOD image from Paul C. Swift made using a Vixen VSD100 f3.8, Starlight Express SXVR-H18 and Baader filters. 

The lenses of the VSD100F3.8 have modern lens multi-coatings developed to match the characteristics of each lens element to achieve 99.9% light transmission at the maximum per lens surface and high contrast without ghosting or flare (patent pending). 

The Strehl intensity of the VSD100F3.8 optics is approximately 10% better than most 4 element lens designs. 

The image circle is as large as 70mm in diameter (60% illuminated) and the star images are as small as 15 microns around the corners, resulting in excellent field flatness. 

The Vixen VSD 100 f3.8 also features a large helical focuser with fine focus scale for smooth, precise, repeatable focusing. 

 

 

 

A 3-element focal reducer (0.79x) and a 4-element tele-extender (1.58x) will also be available. When used with these accessories, the VSD100F3.8 can be transformed to an even faster 300mm f3 astrograph or a versatile 600mm F6.0 telescope for both imaging and visual astronomy. 

Specifications

OPTICAL DESIGN:SD Apochromatic
OPTICAL CONFIGURATION:5 elements, 5 groups including SD and ED elements
APERTURE:100mm
FOCAL LENGTH:380mm
F-RATIO:3.8
RESOLUTION:1.16 seconds
LIMITING MAGNITUDE/td>11.8
IMAGE CIRCLE70mm (at 60% light intensity)
BACK/OUTSIDE FOCUS/td>116mm
SIZE/td>497mm X 115mm
WEIGHT/td>4.5kg
SCREW THREADSM84x1, M60x0.75, M42x0.75
INSERTS/td>60.2mm, 31.7mm
OPTIONAL EXTRASCarry case, finder holder, finder

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