Vixen Optics VSD100 100mm f/3.8 Astrograph APO Refractor (OTA Only)

The VSD100 100mm f/3.8 Astrograph APO Refractor from Vixen Optics is a purpose-built telescope for astrophotography and astro-imaging, with an imaging circle designed to completely cover sensors up to medium-format size. Optically, it's designed with both super-low dispersion (SD) and extra-low dispersion (ED) glass, in a fully multi-coated five-group/five-element apochromatic lens system that corrects for spherical and chromatic aberrations, astigmatism, and off-axis comas. This correction creates a wide flat field of view without distortion and removes the blue-tinted "halo" effect for true high-contrast color transmission. 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 including prime-focus, afocal imaging, or eyepiece projection. A traditional focuser is replaced by a strong non-rotational helical focus system that moves the drawtube to precisely place the focal point onto the camera's imaging sensor. An engraved vernier scale on the drawtube won't wear off over time, makes repeatability easy, and enables precision measurements to as little as 20 microns. Three different size camera adapters are provided to accommodate the most common camera-specific T-rings and accessories. The VSD100 is offered here without a mount or tripod for users who have a reliable support system; an optional mounting ring assembly will be required for proper connection to any mount. For safe transport and storage, Vixen includes a hard aluminum carrying case with a custom-cut foam lining.