About the Vixen Ultra Fast Astrograph VSD 100 / f/3.8...
The innovative wide and flat imaging field, that covers 645 medium format cameras, and 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 Vixen Telescope achieves superb color 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 Vixen VSD 100 Astrograph Telescope comes with an aluminum storage case.
The Strehl intensity on the lens design of the Vixen VSD100 F/3.8 Optical Tube 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. This Vixen Telescope 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 @ 15 microns around the corners, resulting in excellent field flatness. Combine with a Vixen Telescope Mount for excellence in astrophotography.
The lenses of the Vixen VSD100 F/3.8 Optical Tube have the most up-to-date coatings with a result of extremely low reflectivity. These have been developed to match the characteristics of each Vixen Telescope 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.
Don'''t forget... We also carry many fine Vixen Accessories including Vixen Eyepieces, and Vixen Reducers and Adapters. There'''s a complete line of Vixen Telescope Mounts and Vixen Camera Mounts, too!
Vixen Ultra Fast Astrograph VSD 100 / f/3.8 Features...
- Innovative wide and flat imaging field, that covers 645 medium format cameras
- Ideally suited to detect faint stars
- Up-to-date coatings with a result of extremely low reflectivity
- 99.9% light transmission at the maximum per lens surface
- Comes with an aluminum storage case
Vixen Ultra Fast Astrograph VSD 100 / f/3.8 Specifications...
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(*SX tube ring 115mm is not compatibel)
Optical tube weight: 4.5kg
Accessories: Aluminum case, Allen wrench 1.5mm
Optional Accessories: VSD Tube Ring 115mm, Finder Bracket shoe, Camera Mounting adapter for 645D, VSD focal Extender 1.58x, VSD Focal Reducer 0.79xVixen Optics Product Number: 26145