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Vixen SD115SII Apochromatic Refractor Telescope

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Delivery 7-14 days
Product Code
Telescope Type
APO Doublet Refractor
Aperture (mm)
115 mm
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Vixen SD115SII Apochromatic Refractor Telescope OTA

The Vixen SD115IIS is a new 115 mm apochromatic refractor with high-performance Super-ED glass (= SD). The advantage of this SD refractor is its short length and low weight. 

The FPL53 glass reproduces an extremely clear and sharp image by an exceptionally high degree of elimination of residual chromatic aberrations. The SD glass is designed to bring all beams of violet, red, blue, yellow and green very precisely together on the same plane. The special lens material, reduces chromatic aberration across all colours.

The new Vixen SD115SII no longer uses spacer plates, which leads to a significantly better image quality, especially with bright stars. In photographic images, no spikes can be seen on the stars, which were otherwise produced by the spacer plates. In addition, you will be thrilled when you look at the moon or the brighter planets and observe the moon craters pin sharp as well as with extremely high contrast. Also look at the ring planet Saturn or the cloud bands on Jupiter. But of course, brighter deep sky objects such as the Orion Nebula or the Andromeda Galaxy can also be observed in impressive detail.

In combination with the new optional SD Reducer HD Kit or SD Flattener HD, this refractor allows illumination with a 44 mm image circle for full format SLR cameras. 

The older ED81SII, ED103S, ED115S refractors were originally developed for visual observers and photographers using APS-C cameras. However, the new SD series is also optimised for use with full-frame cameras through the use of new inner baffle rings. The large 60 mm eyepiece extension also allows heavy cameras to be attached without tilting. Furthermore, the included folding mirror allows comfortable observation even in unfavourable observation situations and additionally offers a T2 thread for connecting a DSLR camera. This allows you to observe in straight line or at a 90° angle. The carrying handle attached to the tube clamps ensures a secure grip when transporting the telescope. 


  • Objective lens: D=115 mm, multi-coated 
  • 2-lens SD apochromat without spacer plates 
  • No more spikes on the stars 
  • Focal length: 890 mm (f7.7) 
  • Resolution and limiting magnitude: 1.01 arcseconds; 12.5 
  • Light gathering power: approx. 270x more than the human eye 
  • Dimensions and weight: 125 mm dia x 920 mm; 6.3 kg 
  • Viewfinder telescope: 7x50 illuminated 
  • Adapters and connections: 60 mm thread, 50.8 mm and 31.7 mm socket, thread for T-ring 
  • Connection: 50.8 mm and 31.7 mm socket with flip mirror / folding mirror 
  • Photography: primary focus and eyepiece projection 

Specifications: Vixen SD115SII Apochromatic Refractor Telescope

Field of application
  • Deep Sky Observation
  • Deep Sky Photography
  • Lunar observation
  • Lunar photography
  • Planetary photography
  • Planetary observation
Focus Group
  • Advanced Amateurs
  • Specialists and Research
  • Visual enthusiasts
Product Family Refractor telescope
Optical design Apochomatic Refractor
Maximum recommended magnification 230
ED glass
Mirror/Lens diam. 115 mm
Focal length 890 mm
Aperture ratio 7.7
Angular resolution 1.01 arc seconds
Visual limiting magnitude (approx., mag) 12.5
Type of coating Fully multi-coated
Colour of coating green
Finderscope 7 x 50 mm
Material OTA Aluminium
Colour white
Type of tripod thread 60 mm
Transportability good
Eyepiece Barrel Diameter 50.8 mm
Dust protection caps Dust protection caps for front lens and eyepiece holder
Total length 930 mm
Total width 125 mm
Total height 125 mm
Net weight OTA (incl. accessories) 6.3 kg

What's in the Box

What's in the Box: Vixen SD115SII Apochromatic Refractor Telescope

  • Refractor SD115SII Telescope (OTA) 
  • Tube clamp with dovetail 
  • Dew cap 
  • Flip-Mirror / folding mirror 
  • Carrying handle 
  • Dovetail rail 
  • 7x50 viewfinder
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