Used Vixen VSD100 f/3.8 Astrograph Refractor OTA - UT-11383 - SOLD

ITEM #
UT-11383
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  • $4,500.00
  • Regular price $5,990.00

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Accessories Added

  • This is a used scope in excellent condition
  • Superb color correction at f/3.8
  • Totally flat field across the huge 16803 chip

DESCRIPTION

Used Vixen VSD100 f/3.8 Astrograph Refractor OTA - UT-11383 - SOLD

11383: Here is Tony Hallas' Initial test review of the Vixen VSD 100mm f3.8: "The telescope is essentially sensational. It accomplishes the impossible ... a totally flat field across the huge 16803 chip with superb color correction at f/3.8. It is mechanically superb as well, supporting the heavy 16803 camera without any complaint and the enormous helical focuser is tight and accurate. The telescope exhibited good thermal stability appearing to hold focus even as the temperature was dropping. This is significant for an f/3.8 optic. With its extremely fast optics, flat field, and superb color correction it is a unique product, not a rehash of "more of the same."(See Tony Hallas' Image below)

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 scope 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 VSD100 comes with an aluminum storage case.

The Strehl intensity on the lens design of the VSD100 f/3.8 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 and is ideally suited to detect faint stars. The image circle is as large as 70mm in diameter (60% illuminated). Star images are as small as @ 15 microns around the corners, resulting in excellent field flatness.

The lenses of the VSD100 f/3.8 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).

Precision Over-sized Focuser and Large Rubber Focus Ring:

The VSD100 f/3.8 has an oversized focuser that can be attached to the 645 medium format cameras without difficulty. Highly accurate focusing is possible with the non-rotational helical fine focuser, where the distance of drawing in and out the focuser can be read as small as 20 microns with the provided vernier scale. All the graduations are engraved.

SPECIFICATIONS

Aperture100 mm (3.94")
Case IncludedYes
ConditionExcellent
Focal Ratiof/3.8
ManufacturerVixen
Scope TypeAstrograph
Warranty90 Day Covered By OPT

INCLUDED ITEMS

  • Vixen VSD 100 optical tube
  • Standard visual back
  • Hard carry case

 

Questions & Answers

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  • In my experience manual focusing, even when assisted by software like Maxim DL, is approximate at best. That is why I use FocusMax to get the best possible focus on my CCD chip. How is perfect focusing achieved with the VSD? Thanks,

    Because of the limited back focus on the VSD 100 f/3.8, the best way to automate focus may be with a Robofocus and belt drive. The VSD is very similar to the older Pentax 100mm f/4 in design (same designer) and the Pentax 100 and 125 could be automated wi

  • Does the focuser include a rotating ring to rotate the camera?

    The Focuser does not have the ability to rotate the Camera On the Vixen VSD 100 Astrograph

  • Does the focuser include a rotating ring to rotate the camera?

    The Focuser does not have the ability to rotate the Camera On the Vixen VSD 100 Astrograph

  • Does the focuser include a rotating ring to rotate the camera?

    The focuser doesn't have ratating ability, but got another ring after focuser for rotating

  • Does the focuser include a rotating ring to rotate the camera?

    The focuser doesn't have ratating ability, but got another ring after focuser for rotating

  • Does the focuser include a rotating ring to rotate the camera?

    The 2" adapter that comes with the scope has t-threads built in the eyepiece end and the entire adapter can be rotated by simply loosening the thumb screw. If you are using a DSLR, t-threaded camera or camera with 1.25" or 2" nosepiece, it will rotate usi

  • Does the focuser include a rotating ring to rotate the camera?

    The 2" adapter that comes with the scope has t-threads built in the eyepiece end and the entire adapter can be rotated by simply loosening the thumb screw. If you are using a DSLR, t-threaded camera or camera with 1.25" or 2" nosepiece, it will rotate usi

  • What size tube rings fit this scope?

    The official diameter for the tube is 115mm, although other manufacturers' 114mm rings can also work if they are shimmed with compressible felt to accommodate the slightly larger tube.

  • What size tube rings fit this scope?

    Due to the arrangement of the internal mechanisms in the the VSD, it is highly recommended to use the Vixen ring set 26636. If pressure is applied to the tube directly if front of the focus ring, it may have an adverse effect and the focus may grind or be

  • Hello, What is the backfocus of the Vixen VSD 100 f/3.8 and where is it measured from on the OTA? Thanks! jg

    Hi John, The Back focus is 116mm or 63.5mm with the focal reducer. The back focus is measured from the 84mm female threads with the focus all the way in. Thank you, Sean