Vixen VSD100F3.8 Telescope Optical Tube Assembly

Product Description

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 x1
Effective Aperture 100mm
Focal Length 380mm
Focal Ratio f/3.8
Light gathering power 204x unaided eye
Resolving Power 1.16 arc seconds
Limiting Magnitude 11.8
Image Circle 70mm, approx. 60% illumination a the edge (covering 645 format)
Focuser Drawtube diameter 89mm
Adapter threads dia M84-pitch 1mm, M60-pitch 0.75mm, M42-pitch 0.75mm
Push fit 60.2mm, 31.7mm
Filter threads dia 58mm
Size & Weight Optical tube length 497mm
Optical tube diameter 115mm
Optical tube weight 4.5kg

Included
Accessories Aluminum case, Allen wrench 1.5mm
Please note no tube rings included (required are 115mm)