Vixen Telescope SD Flattener HD Kit

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    Vixen Telescope SD Flattener HD Kit
    Vixen Telescope SD Flattener HD Kit

Vixen Telescope SD Flattener HD Kit

37246

  • $438.50

Ready for taking great photos of deep-sky objects!

The SD flattener HD kit is designed for a flat focal plane to produce crisp image of stars with the SD series of APO refractors. It consists of a high performance flattener lens and a connecing tube ring.

Enquire for more information or email us specifics at sales@astro.com.sg.

Vixen Telescope SD Flattener HD Kit Description

"

  • High performance flattener lens.

    The SD flattener HD lens improves off-axis image quality greatly with a minimum change of the focal length. It covers a 44mm photographic field in diameter that is sufficient for the full frame DSLR cameras.

  • Ultimate light transmission AS coatings for extremely high contrast images.

    The same anti-reflection AS coatings that are used for our high-end VSD100F3.8 renowned for extremely high light transmission (99.9% per surface) are provided on each of the lens surfaces of the SD flattener HD. Also, matte-finish is elaborate to eliminate internal reflections and loss of light completely.

  • Optional HD focal reducer.

    If combined with a Reducer HD sold optionally, the focal length will be reduced by 0.79 times (F.7.7 to F6.1) without diminishing the image circle of 44mm. A result is sharp image throughout the photographic field of view.

  • Example taken with a SD103S using the SD Flattener HD: M3 Globular Cluster.

  • Setup diagram.

 

SD Flattener HD Kit

  • Construction
    SD Flattener HD: 2 elements in 1 group
  • Coatings
    AS coatings (Over 99.9% light transmission every single surface)
  • Size/Weight
    SD Flattener HD: 58mm x 34mm long /111g
    Spacer ring SD81: 57.5mm x 22.5mm long /18g
    EX Tube 66: 68mm x 76mm long /89g
  • Others
    52mm filters are usable with the SD Flattener HD.

Use with SD81S

  • SD Flattener HD
    Focal length: 644mm (F7.9)
  • Image circle *1
    44mm
  • Illuminated field of view
    0.89

Use with SD103S

  • SD Flattener HD
    Focal length: 811mm (F7.9)
  • Image circle *1
    44mm
  • Illuminated field of view
    0.83

Use with SD115S

  • SD Flattener HD
    Focal length: 908mm (F7.9)
  • Image circle *1
    44mm
  • Illuminated field of view
    0.8

 

  • *1:Imaging range of good-shaped stars and more than 60% of illuminated field of view. A 44mm in diameter covers an image sensor of full-frame DSLR cameras and a 28.8mm in diameter covers an image sensor of APS-C digital cameras.

Configuration

  • SD Flattener HD
  • Spacer Ring for SD81
  • EX Tube 66