Vixen | Producer of optics from astronomical telescopes and binoculars
Vixen Telescope SD103SII & SD115SII
“For More Beautiful Astrophotography of Nebulae and Star Clusters with the Improved Spacer”
SD103SII and SD115SII Apochromat Refractors
Vixen Co., Ltd. announces to release new SD Apochromat refractors SD103S II and SD115S II respectively succeeding to the SD103S and SD115S refractors.
Employing a new ring spacer around the periphery of the objective lens, these successor models realize uniform diffraction light around the star images for more beautiful star images ever never builds before.
“For more beautiful star images by improved spacer”
In the conventional model 103S and 115S, three pieces of small pieces (tin foil) are arranged evenly around the outer periphery of the lens as a spacer to sandwich the objective lens.
Since the small segment is within the effective diameter of the lens, diffraction occurs when light is incident, resulting in radial defects at three locations around the star image.
Therefore, by changing the spacer from a small piece to a ring delivers excellently uniform diffraction light for more beautiful star images.
“Leading-edge SD glass to suppress color bleeding”
Refractor type telescope which collects light with a lens creates color bleeding (chromatic aberration) due to the difference in the refractive index from the light wavelength (color).
To eliminate the color aberration, extra-low dispersion glass (ED) was invented. This glass literally has little dispersion depending on the wavelength of light, and the refractive index at specific wavelengths shows a value different from that of general-purpose glass. The SD103SII and SD115SII models employ the SD (Super ED) glass lenses made of FPL53, a material that exhibits most excellent optical performance among others ED glasses.
As a result, chromatic aberration is successfully reduced at an extremely high level and deliver extraordinary clear and sharp star images.
For SD glass lenses, g-line (purple), C-line (red), F-line (blue), d-line (yellow), and e-line (green) are all concentrated near the 0 value.
This represents that the lens is designed excellently to reduce chromatic aberration across all colors. In particular, the short-wavelength g-line (purple) aberration is reduced, making it possible to capture stable images.
Designed to meet various needs from visual observation to photography
Placing optimally a focal length in respect to the effective diameter of the objective lens, widely used from planetary observation to shooting nebulae and star clusters.
The flip mirror diagonal provided at the eyepiece section to change over an optical path allows quickly switching between two different power eyepieces or visual and shooting at one time.
The equipped Vixen invented dovetail attachment plate and metal carry handle offers quick attachment on the mount.
“Supporting high-quality imaging with a full-frame DSLR camera and CMOS camera”
In combination use with the optional SD Reducer HD Kit and SD Flattener HD Kit makes it possible to support high quality astrophotography with a full-frame DSLR camera or CMOS camera.
Vicinity of M16 and M17 (with SD103SII and SD Reducer HD Kit)
SD Reducer HD Kit
SD Flattener HD Kit
Link to product page: https://www.vixen.co.jp/product/37246_1/
Excellently visible even in dark night sky! Comes with a new dark field 7x50mm finder scope II
Comes with a new 7x50mm finder scope for astronomy (31.7mm detachable eyepiece unit*).
The built-in crosshair dark field illuminated scale illuminates scale with the crosshair in red by an LED for better visibility even in the dark night sky.
The dimming function incorporated permits adjustment of arbitrary brightness.
The detachable 31.7mm diameter eyepiece unit (eyepiece with crosshair scale) can be used as a guiding scope when used together with a 31.7mm push-in CMOS camera (commercially available) *2.
*1 Optional eyepiece does not focus, even by removing the eyepiece unit (eyepiece section with crosshair scale) and optional 31.7mm eyepiece is installed.
*2 Regarding compatibility with CMOS cameras, as a guideline, the distance from the lower end of the 31.7mm sleeve on the camera side (the constricted part where the thickness changes) to the sensor surface (opposite side of the sleeve) is about 17mm.
Since a focus position may differ from cameras used, way of setting up the CMOS camera and adjusting the focus on the side of the finder scope shall be done by user respectively. Read carefully the instruction manuals for the finder scope and the CMOS camera used. When the focus of the finder scope is adjusted (Focal position of the objective lens is moved), the focus position shall be adjusted when eyepiece unit is used.