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Vixen Optics SD115S 115mm f/8 ED APO Refractor Telescope (OTA Only)
Vixen Optics SD115S 115mm f/8 ED APO Refractor Telescope (OTA Only)

Vixen Optics SD115S 115mm f/8 ED APO Refractor Telescope (OTA Only)

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Your Price: CAD4,999.00
Retail Price:CAD5,106.62

Your Savings:CAD107.62(2%)

Special Order, Usually ships in 1-2 Weeks
Part Number:ES26148

Choose Options or Accessories if Applicable

Finders and Brackets
Focal Reducers/Coma Correctors
Eyepiece Adapters
Imaging Accessories
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Ideal for visual observation as well as prime focus, eyepiece projection, and afocal imaging astrophotography techniques, the Vixen Optics SD115S 115mm f/8 ED APO Refractor Telescope has the largest aperture and longest focal length in the series, boosting its light-gathering ability and magnification potential up from the smaller models—making this an ideal optical tube for any astronomer or photographer who wants to view and photograph the moon, planets and deep sky objects.

Optically, Vixen outfitted the SD115S with FPL53 extra-low dispersion (ED) glass, in a fully multi-coated apochromatic lens system that corrects for both spherical and chromatic aberrations, astigmatism, and off-axis comas. This correction creates a wide flat field of view without distortion and removes the blue-tinted halo effect for true high-contrast color transmission. It can accept both 2" and 1.25" eyepieces and accessories for visual use, and threads on the drawtube allow direct connection of T-rings and other camera mounts.

Included with the the optical tube assembly (OTA) is a flip-mirror diagonal with dual 1.25" holders. The light path can be directed to the upper holder with the mirror in the Up position, and to the rear holder by flipping it down. For visual observation, the mirror can hold two eyepieces to allow easy changes from low to high magnification. When using it for imaging, the camera or imaging system is placed in the back, and an eyepiece can be attached at the top to check alignment and tracking between exposures.

Vixen offers the OTA without a mount and tripod for users who already have a reliable support system, but include a mounting ring assembly and a Vixen-style dovetail plate to make it compatible with a wide variety of mounts. An integrated carry handle makes set up and break down easier and safer.

Optical Tube

  • Designed to capture the entire field of view of a DSLR camera with a full-frame image sensor
  • Large 115mm aperture draws in enough light to view the moon, planets, and deep sky objects
  • Fast f/8 focal ratio makes it ideal for long exposure astrophotography and imaging
  • Long 890mm focal length produces a high magnification potential for viewing and imaging near and deep-sky objects
  • Refractor-style light path delivers clear and sharp image
  • FPL53 extra-low dispersion glass corrects chromatic aberration across the entire visual spectrum for clearer views and images without halos or fringing
  • Apochromatic lens configuration eliminates spherical aberrations that cause distortion at the edges of the field of view, and further corrects chromatic aberrations
  • Anti-reflection multi-coated optics improve light transmission to produce bright and clear high-contrast images with accurate color fidelity
  • Resolution: 1.01 arcsec
  • 60mm and 42mm adapter threads accept T-ring and camera mounts for astrophotography and imaging
  • Rack-and-pinion focusing mechanism; focus lock ensures images remain tack-sharp during long-exposure image capture
  • 2" and 1.25" visual back for eyepieces and accessories


  • Optical tube assembly only — mount head and tripod required for proper use
  • Vixen-style dovetail plate is compatible with a wide variety of mount heads
  • Tube rings enable the OTA orientation to be adjusted for proper balance and to avoid interference with mount and accessories
  • Integrated carry handle for a secure set up and break down
  • Weight: 13.5 lb

Included Accessories

Flip-mirror diagonal:
  • Flip mirror down to direct light straight back or move it up to use upper holder
  • Enables the use of two eyepieces or a guider eyepiece and imaging system
  • 1.25" holders are compatible with a wide variety of eyepieces and accessories
  • 7° field of view
  • 7x power ensures a wide field of view to make alignment easy and star-hopping navigation fast
  • Large 50mm aperture allows dimmer celestial objects to be seen for more alignment options with the ability to more easily find observable objects without star charts or navigation/GoTo systems
  • Illuminated reticle with rheostat to control brightness intensity
  • Includes mounting bracket


Optical DesignRefractor
Focal Length890mm
Focal Ratiof/7.7
Eyepiece Barrel Diameter1.25"
DiagonalFlip-mirror, dual-eyepiece holder
Finderscope7 x 50
Mount TypeVixen-style dovetail
Power SourceNone
Optical Tube Dimensions36.6 x 5.0" / 93.0 x 12.5 cm
Weight13.5 lb / 6.1 kg
Packaging Info
Package Weight18.45 lb
Box Dimensions (LxWxH)44 x 11 x 9"

In the Box

  • Vixen Optics SD115S 115mm f/8 ED APO Refractor Telescope (OTA Only)
  • Mounting Tube Rings
  • Diagonal Flip-Mirror
  • Dovetail Mounting Plate
  • Carry Handle
  • Limited 5-Year Warranty

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