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Vixen Telescope SD Reducer HD Kit

Vixen Telescope SD Reducer HD Kit

Regular price $504.99
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The kit consists of the high-performance flattener lens, reducer lens and connecting rings (Spacer Ring SD81, EX Tube 66) designed for prime focus astrophotography with the SD81S, SD103S and SD115S optical tubes, extraordinary enhancing the flat-field performance, while reducing the focal length by 0.79x. Enjoy high-level prime focus astrophotography by SD series optical tubes which supply two different focal length.

The SD flattener HD improves the flat-field performance toward the edge of field of view closely maintaining the original focal length of the SD-series optical tubes, fully covering the imaging field of DSLR camera with full-format sensor at image circle of 44mm diameter. Using in combination with the supplied Reducer HD, the focal length will be reduced by 0.79x (f/7.7→6.1), while maintaining image circle in dia. 44mm, largely improving sharpness over the entire imaging field of the DSLR camera with full-format sensor.

The same anti-reflective AS coating, which are used for our high-end VSD 100 f/3.8 Astrograph, are used to take advantage of 99.9% superb high transmission of light per lens surface. Loss of light, ghost and flare images are eliminated substantially due to the complete matte finish inside.

The supplied Reducer HD can be used as a reducer for the AX103S and VC200L optical tubes. The AX103S optical tube incorporates a flattener lens and outperforms high imaging capability even by itself. From this reason, the Reducer HD can be used without using the SD Flattener HD. The AX103S covers an imaging field of DSLR camera with full-format sensor with 44mm image circle.

Originally incorporating a flattener lens inside, the VC200L optical tube offers high imaging capability by itself. For this reason, the Reducer HD can be used without using the SD Flattener HD together. The VC200L delivers 36mm image circle (peripheral illumination by 60%) fully covering an imaging field of DSLR camera with APS-C sensor, and also offers comparably sharp images with the center in spite of 47% peripheral illumination at dia. 44mm image circle. It covers an imaging field of DSLR camera with image circle of dia. 28.8mm with APS-C sensor and dia. 44mm with full-format sensor.

Full-format and APS-C is a common name for size representing the size of the light-receiving plane (imaging sensor or film) of DSLR camera. Full-format (36x24mm), APS-C (23x16mm) and Four Thirds (17.3x13mm) are typical available standard for DSLR cameras. In general, the larger the light-receiving plane, the larger the range can be shot.


SD Flattener HD 2 elements in 1 group; Reducer HD : 2 elements in 2 group
Coating AS Coating (Over 99.9% light transmission on every single surface)
Size/Weight SD Flattener HD : Φ58×34mm/111g;Reducer HD : Φ68×45.2mm/218g; Spacer Ring SD81 : Φ57.5×22.5mm/18g; EX Tube 66 : Φ68×76mm/89g
Others SD Flattener and Reducer HD can be used with 52mm Filter


Vixen warranties its products to be free from initial defects in materials and workmanship for a specified period based on part type:

Vixen Electronic Parts: Limited One Year Warranty

Vixen Mechanical Parts: Limited Two Year Warranty

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CA Residents: Prop 65 WARNING(S)

    • We are happy to offer free shipping to all bordering states in the United States
    • Shipping typically takes 2-5 business days and is sent directly from the manufacturer
    • A tracking number will be provided when the manufacturer ships out the items. Please allow up to 5 business days to be provided with a tracking number

      30-Day Return Policy: no postage, no restocking fee, no worries!

      Astraeus Optics will cover shipping fees as well as any restocking fee that the manufacturer enforces.

      To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging. Custom made items are not eligible for returns or refunds.

      There are certain situations where only partial refunds are granted: (if applicable)

      • Any item not in its original condition, is damaged or missing parts for reasons not due to our error.
      • Any item that is returned more than 30 days after delivery

      You can request a refund by Contacting Us.
      We will credit you for the total purchase price upon the receipt of your return. Products returned under this policy are eligible for a refund to the original method of payment.

      Defective Product Returns

      We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at support@astraeusoptics.com


      We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too.
      If more than 15 business days have passed since we’ve approved your return, please contact us at support@astraeusoptics.com

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