COVID-19 DELIVERY INFO - We are shipping normally with only some minor delays, all deliveries are now contact-less. Stay safe.
Show Store Sections+
Home Telescopes Vixen Telescopes Vixen VSD100F3.8 Telescope Optical Tube Assembly
The Vixen VSD 100mm f3.8 Astrograph features an innovative wide and flat imaging field, that covers medium format cameras. The 5 elements in 5 group lens design completely eliminates a violet tint in chromatic aberration (blue halo). With an SD lens in the front objective group and an ED lens in the rear objective group, this scope achieves superb colour correction. The blue halos around stars, that are visible in astrophotography and are hard to reduce with a 4 elements in 4 group lens design, are corrected successfully. In addition, astigmatism and coma aberrations are corrected to an extremely high level of image quality. The VSD 100 comes with an aluminum storage case. The Strehl intensity on the lens design of the VSD100F3.8 is better than that on a 4 elements in 4 group lens design by approximately 10%. It does not decrease abruptly on stars away from the center of a photographic field. It is ideally suited to detect faint stars. The image circle is as large as 70mm in diameter (60% illuminated). The star images are as small as at 15 microns around the corners, resulting in excellent field flatness. 5 Year Warranty.The lenses of the VSD100F3.8 have the most up-to-date coatings of extremely high reflectivity. These have been developed to match the characteristics of each lens element in order to avoid the deterioration of image contrast due to the increase of lens elements. It boasts of a 99.9% light transmission at the maximum per lens surface and achieves superb images with extremely high contrast with no ghost and no flare images. (Patent pending). With extremely fast optics, flat field, and superb colour correction it is a unique product Precision Glass Annealing Process and a Premium Zygo Verifier ATZ Laser Interferometer. In the process of manufacturing optical glass, all the five lens elements are annealed with a precision annealing process (The annealing can straighten molecular arrangements of lens elements and thus unify the characteristic of optical glass.) The homogeneity of refractivity in optical glass is enhanced to the highest degree. Delivery is normally around three business days.Objective lens design SD Apochromatic, fully AS coatings, 5 group-5 element design(SD lens x1, ED lens x1Effective Aperture 100mmFocal Length 380mmFocal Ratio f/3.8Light gathering power 204x unaided eyeResolving Power 1.16 arc secondsLimiting Magnitude 11.8Image Circle 70mm, approx. 60% illumination a the edge (covering 645 format)Focuser Drawtube diameter 89mmAdapter threads dia M84-pitch 1mm, M60-pitch 0.75mm, M42-pitch 0.75mmPush fit 60.2mm, 31.7mmFilter threads dia 58mmSize & Weight Optical tube length 497mmOptical tube diameter 115mmOptical tube weight 4.5kgIncludedAccessories Aluminum case, Allen wrench 1.5mmPlease note no tube rings included (required are 115mm)
Item added to your wishlist
Go to wish list Or click close to return to your product