Aperture
18" (459 mm, Effective aperture: 455 mm), F 4.5, f: 80.2" (2037 mm).
The secondary mirror is 3.1" (79 mm) with 17 mm thick. The optics have
recoated in June 2015 by
Galaxy Optics,
Colorado, USA. The reflectivity of the primary and the secondary are
96% and 97%, respectively.
A
wood bar suspending from the top ring is used to move the telescope
down ward: I grab it and push down when I sweep the sky vertically. The
light shroud was renewed in 2010: the present shroud was made by
AstroSystems, Colorado,
USA.The light shield is attached over the eyepiece.
Left: Secondary
cage.
A piggyback ride Regal Quick-Finder on a 50 mm right
erect finder, and a digital
setting circles, Nexsus DSC. The eyepiece, I usually use for comet
hunting, is Ethos
21 mm with 97x and 1.0˚ actual field of view (FOV). A light shield is placed
over a white
plastic part on the eyepiece. Another eyepiece that I use is Planocular
30 mm, manufactured
in Germany with 88˚ apparent FOV, which is combined with Parracor with 78x
and 1.1 ˚
apparent FOV. Once I used Planocular 30 mm alone with 68x and 1.3 ˚ actual FOV.
The
dew shield made by insulator for water supply pipe (white colored) is
placed on the Quick-Finder and the eyepiece of the 50
mm finder. Only when I peer into finders I remove the dew shields. A long dew shield hood is
placed for the objective of 50 mm finder.
Center: Nexus DSC
(left)
and iPad mini2 (right) that
displays SkySarari
4 Pro. iPad receives signal from
Nexus DSC via WiFi and the FOV of my comet-seeker links with SkySafari
4 Pro (a
digital map). Since the FOV always links to
the map, it is very easy to identify DSOs. A red transparent plastic sheet on iPad mini2 can be
flipped up by picking up gTeleVueh sticker with fingers (see photos
below).
Right:
Rear view
The power line extends from the rocker box
where
the battery is placed to the secondary cage via the heater controller.
There
are two heaters; one is applied to the secondary mirror and another is
to the
eyepiece. Kendrick Dew Remover System is installed in the secondary
mirror and
can be attached on the eyepiece.
Multifunctional stepladder
Left:
iPad mini 2 is placed on the stepladder using an attachment with
flexible arm (not detached every session). LED lamp is fixed using
Velcro and rubber string. Note that the clipboard is not vertical but
inclined to avoid dew or frost condensation on the paper (not seen).
Right: Close-up of iPad mini
2. Red plastic cover is flipped.
Left: Front view of the secondary cage
Right:
Rear view of a mirror cell. There is a cooling fan at the center. Two
vertical wood blocks are to protect three light collimation
knobs, when the mirror box is placed on the ground.
Top view of 18 point flotation cell.
A primary mirror and trusses are removed. The photo was taken in 2003.
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Assembling
Left: Installing truss-tube poles.
Center: Connecting truss poles and the secondary cage.
Right: Pulling on the light shroud. White counter weight, which
is metal chain covered with white foam, is in the secondary cage. At
this stage, it is bottom heavy. The counter weight is removed after the
finders and
other gears are installed on the secondary cage.
Photos were taken in 2003
Left: Each wedge is stuck inside of the cage using Velcro.
Center: The wedge is screwed between a pair of poles.
Right: Inside view of the pole seats and wedge. Velcro is placed
on the surface of the wedge and inside wall of the secondary cage.
Photos were taken in 2003
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Takedown & loading
Left: Loaded primary mirror and truss-tube poles
1: primary mirror, 2: plastic bag with chuck, 3: silica
gel in paper bag, 4:
truss-tube poles, 5: cleaner to vacuum air in a plastic bag,
6: eyepiece boxes,
7: homemade PVC primary mirror cover, 8: ladder, 9: parts box, 10:
plywood
plate (lifted)
Center: Loaded mirror box
11: step for loading
Right: Completion of loading
12: clothes box, 13: white form for shock absorbing
Left: All
the components are covered with insulation sheets in summer.
Right:
My new car is Toyota NOAH. Even though the telescope occupies the third
row seats, four persons can ride in total including a driver: two
persons each on the first and the second row seats, respectively.