Features

• High-performance SD glass lens that suppresses color fringing
• Prepared to meet a wide range of purposes from visual observation to astrophotography
• Available for full-frame DSLR cameras/CMOS cameras, suitable for high-quality astrophotography

Description

103mm aperture SD apochromatic refractor introducing a new spacer ring for more beautiful astrophotography

It is the successor to the favorably reviewed SD103S as a photo-visual optical tube that is the SD series of apochromatic refractors. With an aperture of 103mm and a focal length of 795mm, you can use it for a wide variety of purposes, from visual observation to astrophotography. We changed the spacers used around the outer periphery of the objective lens from three pieces of foil fragment to the shape of a ring to uniform the diffraction light of star image. It has obtained you a more beautiful star image. In combination with an optional SD Flattener HD Kit and an optional SD Reducer HD Kit, it develops into a high-performance astrograph providing an image circle of 44mm suitable for a camera/CMOS camera with a full frame imaging sensor.

Improved spacers for beautiful star images 

In the refractor that gathers light using a lens, color fringing (chromatic aberration) occurs by the difference in refractive index from different wavelengths (colors) of the light that passes through the lens. Then, an invention was extra-low dispersion glass to eliminate the chromatic aberration. This glass shows less dispersion in different wavelengths of light, and its refractive index at a particular wavelength shows a value different from that of glass for general use. The SD103SII uses an SD glass (Super ED) lens made from FPL53 glass, a material that exhibits particularly excellent optical performance among ED glass. As a result, it successfully suppresses chromatic aberration at a high level and produces star images clearly and sharply. In the SD glass lens, g-ray, C-ray, F-ray, d-ray, and e-ray all come near the 0 value. That indicates the lens is excellent because the chromatic aberration is held at an extremely low level over all the visible colors. In particular, remarkably reduced aberration of the g-ray (purple) that is short wavelength enhances star images crisply.

Prepared to meet a wide range of purposes from visual observation to astrophotography

Specs

Warranty

Vixen warranties its products to be free from initial defects in materials and workmanship for a specified period based on part type:

Vixen Electronic Parts: Limited One Year Warranty

Vixen Mechanical Parts: Limited Two Year Warranty

CA Residents: