| <Optics> |
| The air-spaced Fraunhofer doublet 80mm f/15 achromat objective lens is
made by Kubota Optical (Hanamaki-City, Iwate, Japan.). All four surfaces are HTM fully multi-coated,
achieving extremely high transmission rate as 99.8% total. Thanks to the
stable long-focus achromat design, both chromatic and spherical aberrations
are very well corrected. Furthermore, Kubota Optical's careful and precise polishing technology has resulted in extremely precise
and smooth optical surfaces, which provide peerlessly high image quality.
Even at excessive magnifications as exceeding 200-250x, there's little
perceptible image deterioration, and, with the high transmittance, it's
not only sharp and clear but yields very beautiful images with rich tones,
especially on planetary surfaces. It's really a premium objective lens
that boasts ultimate performance and truly embodies the "Made-in-Japan
pride", and the main reason why Kasai decided to develop this scope
was just because we are really fascinated by the high potential of this
lens. |
| <Focuser> |
| GSO 2" dual-speed Crayford focuser is adopted. Equipped as standard
with a microfocus mechanism with a reduction ratio of 1:10, it provides
an extremely smooth and delicate focusing touch with no backlash, ensuring
that critical focus positions are not missed at high magnifications. Metric/inch
scales on the upper surface of the drawtube. Two fastening screws with
a brass compression ring for 2” eyepiece adapter. A 2"-1.25"
Adapter (w/M48 filter threads) comes standard. The 145mm max. long backfucus
and 80mm long focus travel allow the use of most 2" accessories to
reach the infinity focus easily. A Vixen/GSO/Synta compatible finder bracket
base (finder shoe) comes standard. |
| <Tube / Dewcap / Lens Cell> |
| The main tube and the dewcap are made of lightweight & robust aluminum
alloy with beautiful glossy white finish. All inside the tube are thoroughly
anti-reflection mat painted and well-designed baffles placed to eliminate
the stray lights efficiently, contributing to improve image contrast. The
objective lens cell is made of thick solid aluminum alloy, holding the
delicate lens securely. On the side of the tube, along with the optical
specification, a silver emblem is affixed to ensure that the scope is made
in Japan. |
| <Tube Rings & Plate> |
| A pair of lightweight metal tube holders and a 335mm long Vixen-compatible
dovetailed plate come standard. The long-enough plate helps prevent slight
vibrations of the long tube when loaded on a mount. In addition, in the
center of the dovetailed plate are 2 holes (8.2mm dia. / 35mm distance)
compatible for most Takahashi mounts to be fixed with two M8 bolts directly. |
| <Collimation> |
| Precisely machined tube and durable lens cell structures ensure to keep
the optical axis so firmly. Furthermore, as we collimate each unit perfectly
one by one before shipment, there will never be need for the re-collimation
by the users. As long as in the normal use, it can be used completely maintenance-free. |
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