Vixen SD Reducer HD Kit

Let us take photography of Nebula! High-Performance Flattener and Reducer Kit High-Performance Flattener and Reducer Kit with connecting rings for SD81S, SD103S, and SD115S optical tubes. Vixen Telescope SD Reducer HD Kit Description 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, extraordinary 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 lengths. 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 the field of view closely maintaining the original focal length of the SD-series optical tubes, fully covering the imaging field of DSLR camera with the full-format sensor at an 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 the image circle in dia. 44mm, largely improving sharpness over the entire imaging field of the DSLR camera with the full-format sensor. High contrast! AS Coating! The same anti-reflective AS coating, which is used for our high-end VSD 100 f/3.8 Astrograph, is 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. Compatible 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. For this reason, the Reducer HD can be used without using the SD Flattener HD. The AX103S covers an imaging field of a DSLR camera with a full-format sensor with a 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 a DSLR camera with an 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 a DSLR camera with an image circle of dia. 28.8mm with APS-C sensor and dia. 44mm with a full-format sensor. Example Image with SD103S SD Flattener HD: M3 Globular Cluster Full-format and APS-C is a common name for size representing the size of the light-receiving plane (imaging sensor or film) of a DSLR camera. Full-format (36x24mm), APS-C (23x16mm), and Four Thirds (17.3x13mm) are typically available standards for DSLR cameras. In general, the larger the light-receiving plane, the larger the range can be shot. Example Image with SD103S SD Flattener HD: M31 Andromeda Galaxy System Structure Diagram Specifications SD Reducer HD Kit 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 SD81S SD Flattener HD Focal Length 625mm→644mm (1.03x) f/7.7→7.9 SD Flattener HD Reducer HD Focal Length 625mm→496mm (0.79x) f/7.7→6.1 Image Circle Φ44mm Peripheral Illumination 89%(SD Flattener HD); 72%(SD Flattener HD Reducer HD) SD103S SD Flattener Focal Length 795mm→811mm (1.02x) F7.7→7.9 SD Flattener HD Reducer HD Focal Length 795mm→624mm (0.79x) f/7.7→6.1 Image Circle Φ44mm Peripheral Illumination 83%(SD Flattener HD); 63%(SD Flattener HD Reducer HD) SD115S SD Flattener Focal Length 890mm→908mm (1.02x) F7.7→7.9 SD Flattener HD Reducer HD Focal Length 890mm→699mm (0.79x) f/7.7→6.1 Image Circle Φ44mm Peripheral Illumination 80%(SD Flattener HD); 60%(SD Flattener HD Reducer HD) AX103S Focal Length 825mm→635mm (0.77x) f8→6.2 Image Circle Φ44mm Peripheral Illumination 0.63 VC200L Focal Length 1800mm→1386mm (0.77x) f9→6.9 Image Circle Φ36mm※2 Peripheral Illumination 0.6 ※1: Over 60% is secured in acceptable image range as well as peripheral illumination. It covers an imaging field of (D)SLR camera of full-format at dia. ※2：Dia. 44mm for imaging field (47% at peripheral illumination) Configuration Reducer HD SD Flattener HD Space Ring SD81 ED Tube 66