Vixen SD-Reducer-HD-Kit Reducer and flattener

High Performance Flattener and Reducer Kit

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, extroordinary enhancing the flat-field performance, while reduing the focal length by 0.79x. Enjoy high level prime focus astrophotography by SD series optical tubes which supply two different focal length.

Ultra Sharp Image Over Entire Imaging Field on DSLR Full-format Sensor

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 turn to f/6.1), while maintaining image circle in dia. 44 mm, largely improving sharpness over the entire imaging field of the DSLR camera with full-format sensor.

High contrast AS Coating

The same anti-reflective AS coating, which are used for Vixen´s 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.

Comptible with AX103S and VC200L Telescopes

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 44 mm image circle.

Originally incorporating a flattener lens inside, the VC200L optical tube offers high imaing capability by itself. From this reason, the Reducer HD can be used without using the SD Flattener HD together. The VC200L delivers 36 mm 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. 44 mm image circle. It covers an imaging field of DSLR camera with image circle of dia. 28.8 mm with APS-C sensor and dia. 44 mm with full-format sensor.

Note: You will need a Wide Photo Adapter and possibly a T2 ring, both not included.

Manual from the manufacturer

You can find a manual here.

Possible combinations

Drawings with dimensions and thread sizes

Overview of the different telescope/flattener/reducer combinations