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The VSD100 100mm f/3.8 Astrograph Refractor from Vixen Optics is a purpose-built telescope for astrophotography and astro-imaging, with an imaging circle capable of covering up to medium-format 645 sensors. Optically, it's designed with a fully multicoated 5-group/5-element apochromatic lens system that corrects for spherical and chromatic aberrations. This correction creates a wide flat field of view without distortion and removes the blue-tinted "halo" affect for true high-contrast color transmission. Astigmatic and coma aberrations are also corrected. Front M112x1 and rear M58x0.75 threads allow the use of filters that can stay on, even if the user wants to change cameras.
The scope can be used for multiple astrophotography techniques included prime-focus, afocal imaging, or eyepiece projection. A traditional focuser is replaced by a non-rotational helical focus system which moves the drawtube forward or back to place the focal point onto the camera's imaging sensor. The vernier scale on the drawtube is engraved for durability and repeatability and enables precision measurements to as much as 20 microns. Three different size camera adapters are provided to accommodate the most common camera-specific T-rings and accessories.
f/3.8 focal ratio
380mm focal length
Apochromatic 5-group/5-element lens design corrects for spherical and chromatic aberrations
Views show a wide and flat field of view without distortion at the edges - spherical aberration
Colors are faithfully rendered by eliminating the blue "halo" effect of chromatic aberrations
Astigmatism and coma aberrations are also corrected
Anti-reflection fully multicoated optics
Use for prime focus, Afocal imaging, or eyepiece projection astrophotography
Push fit: 60.2mm and 31.7mm
M84x1.0, M60x0.75mm, M42x0.75mm camera adapter threads
70mm imaging circle, with approximately 60% illumination at the edge
Designed to cover a 645 medium format sensor
58mm filter thread
89mm diameter drawtube
Knurled non-rotational helical focus ring
Focus ring lock sets drawtube in place
Precision vernier scale on the drawtube for exact focal point placement to 20 microns