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Vixen Optics VSD100 100mm f/3.8 Astrograph Refractor


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Product ID :
95950
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Product Description

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.

Optical Performance
  • 100mm aperture
  • 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
Imaging
  • 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
Focusing
  • 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
  • Vernier scale engraved on drawtube for durability
Construction Details
  • Anodized aluminum optical tube
  • 1/4"-20 tripod mount
  • M112x1 objective filter thread
  • Hard aluminum carrying case

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