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(S = to fit 160mm - 250mm tube dia. / L = to fit 250mm to 580mm tube dia.) |
| "I want to make the secondary obstruction of my Newtonian as small
as possible by reducing the backfocus out of the telescope tube",
"I want to get as long backfocus as possible for prime focus photography",
"I want my Newtonian to reach the focus with my binoviewer, by using
a lower-possible power focal extender to get lower-possible magnifications", etc. ..... recently the demands for low-profile focusers are increasing
among amateur astronomers. However, concerning ordinary single-drawtube
focusers, the lower the focuser's profile is, the shorter the focus travel
becomes, and additional extension tubes are inevitably required when switching
a camera or a binoviewer to an eyepiece. Now, we Kasai Trading are ready
to offer the very best solution for such problems. |
| <Dual Drawtubes> |
| Kasai Low-Profile Micro Focuser is equipped with dual drawtubes. In spite
of the total height (from the bottom surface of the base plate to the 2"
adapter end) of whole the focuser is only 47mm, the total focus travel is such long as 70mm: 26mm travel by the outer tube + 44mm by the inner. While, the drawtube's
maximum inner height (sticking-out inside the telescope tube when the drawtube
is most shortened) is only 15mm or shorter, so it will not interfere the
incoming light path. The outer tube is operated with the feather-touch
dual-speed crayford focusing mechanism (see below), and the inner tube
is to be pushed-and-pulled so smoothly. The 2" eyepiece adapter and
the joint part of the tubes employ compression ring stopper system. As
a standard accessory, 1.5mm-height extra low-profile 1.25" eyepiece
adapter (M48 filter threaded) is included. |
| <1:10 MIcro Focusing Mechanism> |
| Luxury-looking focusing unit with mat-silver & mat-gold finished knobs
includes 1:10 micro focusing mechanism. The focusing feel of this crayford
system is truly "feather-touch", causing no vibration to the
telescope. The tension adjusting function and the focus stopper are fully
equipped. |
| <Housing & Finish> |
| Most consisting components are CNC-machined and glossy black anodized,
offering top-quality atmosphere. The inner surfaces of the drawtubes are
thoroughly mat-blackened to eliminate the incoming stray lights. |
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| <Base Plate> |
| The base plate is a universal type, fitting various diameter telescope
tubes. Besides, so that it can keep low-enough profile regardless of the
tube diameters, we offer two different models: "S" is to fit
160mm to 250mm tube diameter, while "L" is to fit 250mm to 580mm.
(Please specify either type when ordering.) In addition to the normal fixing
holes for four M4 or M5 screws, two oblong holes are furnished so that
it can be fixed with two screws and the whole focuser can be slid left
and right. This function will be useful when adjusting the focuser position
against the secondary mirror, or extending the backfocus combined with
the collimation screws of the secondary mirror, or else. |
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