Vixen SD Flattener HD Kit
The Vixen SD Flattener HD Kit includes the SD Flattener HD filed flattener, the EX Tube 66 extension tube and the specific extension tube to be used along the SD81S. Complete correcting lens system for Vixen SD81S, SD103S e SD115S optics.
Vixen SD Flattener HD Kit
The Vixen SD Flattener HD Kit includes the SD Flattener HD filed flattener, the EX Tube 66 extension tube and the specific extension tube to be used along the SD81S.
It is complete correcting lens system for Vixen SD81S, SD103S e SD115S optics designed to work with digital cameras or CCD/CMOS up to full-frame format (24x36 mm). Transforms Vixen SD optics into flat field astrographs. You can add the optional RD Reducer HD focal reducer to be used in combination with the SD Flattener HD field flattener to shorten the focal length.
When used along a Vixen SD optics you get a corrected field with the highest edge illumination possibile. The field flattener enlarge focal length by 1.03x and 1.02x on Vixen SD81S and Vixen SD103S/SD115S respectively (focal ratio become F/7.9). With the optional SD Reducer HD the focal ratio goes down to ~ F/6.1
Vixen AS Coating
All the new high performance correctors by Vixen include the highly renowned Vixen AS Coating that ensures over 99.9% light transmission for each optical surface. It is the same coating used also in the Vixen flagship VSD 5-lens astrograph. This advanced coating enhances contrast and cuts down to a negligible effect any possibile loss of light and any ghost or flare image.
SD Flattener HD specifications
Optical tube | SD81S / SD103S / SD115S |
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Focal length | 625 mm / 795 mm / 890 mm |
Magnfication | 1,03x / 1,02x / 1,02x |
Resulting focal length | 644 mm / 811 mm / 908 mm |
Focal ratio | F/7.9 |
Image circle *1 | 44 mm |
Peripheral illumination |
89% / 83% / 80% |
Optical design | 2 elements in 1 group |
Coating | Vixen AS Coating (over 99,9% light transmission for each lens surface) |
Dimensions / Weight | 58 x 34 mm / 111 g |
*1 : Over 60% is considered an acceptable value in photography. Field correction covers an imaging field of 44 mm so bigh enough to cover the full-frame APS format (24 x 36 mm) and much higher than APS-C format (28.8 mm).
Vixen SD Spot diagrams
Vixen SD103S spot diagrams at prime focus without correctors (F/7.7)
Vixen SD103S spot diagrams at prime focus with SD Flattener HD field flattener (F/7.9)
Example images
The M3 globular cluster taken with Vixen SD103S and SD Flattener HD field flattener
System Chart
Product Status | New |
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Package width | 12 cm |
Package height | 8 cm |
Package depth | 12 cm |