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Kit composed by the Vixen SD103S doublet apochromatic refractor, the SD Flattener HD field corrector and the SD Reducer HD focal reducer. With this kit you will get an high performance flat-field astrograph capable to cover the full-frame image format. Double focal length for maximum versatility!
Kit composed by the Vixen SD103S doublet apochromatic refractor, the SD Flattener HD field corrector and the SD Reducer HD focal reducer. With this kit you will get an high performance flat-field astrograph capable to cover the full-frame image format. Double focal length for maximum versatility!
Contact us for info about connecting your DSLR or your CCD / CMOS cameras.
The Vixen SD103S apochromatic refractor is completely made in Japan and delivers an high quality SD doublet lens with 103 mm of aperture and 795 mm focal length (focal ratio F/7.7). You will find the best optical quality as usually delivered by Vixen along a sturdy yet ligh optical tube. Weight of the optical tube only is 3.6 Kg.
A new apochromatic refractor with high-performance Super ED Glass (=SD) made of leading-edge FPL53 glass reproduces extremely clear and sharp image by extraordinary eliminating color aberration.
The SD glass is designed to gather all g-ray (purple), C-ray (red), F-ray (blue), d-ray (yellow), and e- ray (green) around 0 value, which stands for an excellent lens material surprisingly reducing chromatic aberration over all colors. Using in combination with new optional SD Reducer HD Kit or SD Flattener HD Kit , it allows 44 mm image circle with full-format (D)SLR camera.
ED81SII, ED103S, ED115S were originally designed for both visual observation and photo visual users. SD Optical Tube Series optimized its position of "baffle" inside of draw tube in order to be compatible with full-size DSLR.
Leasing | 12 installments at zero interest |
The Vixen SD Reducer HD Kit includes the SD Flattener HD filed flattener, the SD Reducer HD aplanatic focal reducer, the EX Tube 66 extensione tube and the specific extensione tube to be used along the SD81S.
It is complete correcting and reducing 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 with two differents focal ratio available. You can choose to use the HD field flattener only or in combination with the HD focal reducer.
You can use the SD Reducer HD only with flat field instruments such as the Vixen AX103S or the Vixen VC200L Visac.
On the Vixen SD optics you can use the SD Flattener HD only in order to 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 SD Reducer HD the focal ratio goes down to ~ F/6.1
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 cuts down to a negligible effect any possibile loss of light and any ghost or flare image.
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 |
Optical tube | SD81S / SD103S / SD115S |
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Focal length | 625 mm / 795 mm / 890 mm |
Magnfication | 0,79x |
Resulting focal length | 496 mm / 624 mm / 699 mm |
Focal ratio | F/6.1 |
Image circle *1 | 44 mm |
Peripheral illumination | 72% / 63% / 60% |
Optical design | 2 elements in 1 group + 2 elements in 2 group |
Coating | Vixen AS Coating (over 99,9% light transmission for each lens surface) |
Optical tube | AX103S / VC200L |
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Focal length | 825 mm / 1800 mm |
Magnfication | 0,77x |
Resulting focal length | 635 mm / 1386 mm |
Focal ratio | F/6,2 / F/6,9 |
Image circle *1 | 44 mm / 36 mm *2 |
Peripheral illumination | 63% / 60% |
Optical design | 2 elements in 2 groups |
Coating | Vixen AS Coating (over 99,9% light transmission for each lens surface) |
Dimensions / Weight | 68 x 45.2 mm / 218 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).
*2 : Field correction covers a diameter 44 mm, but at the edge you will get a 47% illumination only. So we reccomend sensors up to 36 mm diameters, corresponding to the APS-H format.
The Vixen AX103S astrograph is natuvely corrected up to full-frame 24x36 mm format, but the former 0.7x reducer has been designed for sensor up to APS-C format. Now the new SD Reducer HD covers also the full-frame format, although reduction is a little bit lower (F/6.2 vs. F/5.6).
The Vixen VC200L Visac catadioptric is well known as a great imaging performer also on big sensors. Performances were good also with the former 0.71x focal reducer, expecially with sensors up to APS-C format, but now with the new SD Reducer HD focal reducer you can have an even better field correction over a 44 mm image circle, although we reccommend sensor up to 36 mm image circle because of vignetting at the edge. Field illumination at the edge of the 36 mm image circle is 60%, and only 47% at the edge of the 44 mm image circle.