Ideal for visual observation as well as prime focus, eyepiece projection, and afocal imaging astrophotography techniques, the Vixen Optics SD81S 81mm f/8 ED APO Refractor Telescope is an ideal addition to an amateur astronomer or photographer's kit.
Optically,
Vixen outfitted the SD81S with FPL53 extra-low dispersion (ED) glass,
in a fully multi-coated apochromatic lens system that corrects for both
spherical and chromatic aberrations, astigmatism, and off-axis comas.
This correction creates a wide flat field of view without distortion and
removes the blue-tinted "halo" effect for true high-contrast color
transmission. Threads on the drawtube allow direct connection of T-rings
and other camera mounts.
Included with the the optical tube
assembly (OTA) is a flip-mirror diagonal with dual 1.25" holders. The
light path can be directed to the upper holder with the mirror in the Up
position, and to the rear holder by flipping it down. For visual
observation, the mirror can hold two eyepieces to allow easy changes
from low to high magnification. When using it for imaging, the camera or
imaging system is placed in the back, and an eyepiece can be attached
at the top to check alignment and tracking between exposures.
Vixen
offers the OTA without a mount and tripod for users who already have a
reliable support system, but include a mounting ring assembly and a
Vixen-style dovetail plate to make it compatible with a wide variety of
mounts. An integrated carry handle makes se tup and break down easier
and safer.
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