Observatory and Equipment
VISUAL EYEPIECES USED AT OZ: Shown
at right are the various eyepieces used for
visual observing. Clockwise, starting at upper
left: 41mm TeleVue Panoptic (70X, 57 min.
fleld ), 31mm TeleVue Nagler type 5 (90X, 53
min. field ), 20mm TeleVue Nagler type 2
(140X, 37 min. field), 16mm TeleVue Nagler
type 2 (175X, 28 min. field), 14mm E.S.
100deg. (200X, 30 min. field), 12mm TeleVue
Nagler type 4 (233X, 21 min. field), 9mm
TeleVue Nagler type 6 (311X, 15 min. field).
Land of Oz Observatory: A 12' X 20' Roll-off roof observatory located
in Linn County, Kansas, about an hour south of the Kansas City metro area.
Construction is standard stud-wall frame construction, with exterior of vinyl
siding and roof of 16-gage corrugated steel. Interior consists of a 12' X 12'
telescope room and a 12' X 8' insulated control room.
The left-hand photo shows the C-11 and
the
MI-250 Go-To mount, the Gemini I
control and hand pad, as well as the USB
and serial cables that go from the scope
through an under-floor conduit to the
control room. This allows remote control of
both the
MI-250 Go-To mount, the
Starlight ExpressSXVR-H694Cor
ZWO-ASI071  
imaging cameras and the
StarShoot  auto-guide camera from the
control room. In the background is the
6-inch Newtonian reflector which I built
while in High School.

The photo on the right shows the desk in
the control room, with the
Hewlitt Packard
Pavilion g6-201 3.1 gHz Laptop
, which
controls the telescope via
The Sky 6 and
the guiding and imaging cameras via
Maxim DL. Just to the right of the laptop is
the control box for the
MicroTouch
motorized focuser, which controls focus of
the
C-11, and to the right of the
MicroTouch control is the control box of
the
JMI MotoFocus,which controls focus
of the
Orion 80mm guide scope.
IMAGING AT LAND OF OZ

Set-up, hardware & instrumentation used for CCD Imaging
10/15/17: NEW WIDE-FIELD IMAGING CAMERA AT OZ
NEW WIDE-FIELD CAMERA SETUP: The two
photos at the right show the latest equipment
installed at Land of Oz Observatory. To the
immediate right is the new ZWO-ASI071-MC
CMOS-based color imager mounted on the Hyper
Star lens assembly. Using this configuration, the
new camera has a resolution of 1.76 arc-seconds
per pixel and an imaging field of 145 arc minutes
by 95 arc minutes (Approx. 2.5 X 1.5 degrees).
The new camera operates using MAXIM DL5 via
an ASCOM link. The first images taken with this
new setup can be seen on the
Latest Images
page of this website.
UPDATE: The only problem encountered with the
new setup concerned slow and/or erratic image
downloads. This has since been corrected with the
installation of a dedicated active USB 3.0
connection between the camera and the H-P
laptop computer in the adjacent Control Room.
MAIN INSTRUMENTS: The primary instrument used
at Land of Oz Observatory is an 11-inch (280mm)
CELESTRON Schmidt-Cassegrain telescope of 110
inch (2800mm) focal length. This telescope is mounted
on a
Mountain Instruments MI-250 Go-To German
Equatorial Mount. The
MI-250 has a load capacity of
75 pounds, and features massive, conically-shaped
Polar and Declination axes, each driven by 7.5 inch
diameter bronze gears and matching diamond lapped
stainless steel worms.Tracking accuracy of this mount
is better than + or - 4 arc seconds. The mount is
computer controlled via
THE SKY 6 software through
the
GEMINI 1 controller. The CELESTRON C-11
optical tube assembly is mounted to the MI-250 via a
Robin Casady precision tip-in dovetail saddle
assembly. An
Orion ED-80 80mm (3.1") Apochromatic
refractor, used for guiding, is mounted co-axially on the
C-11 tube assembly via Losmandy heavy duty dove-
tails and 150mm heavy duty rings. A 12 X 80mm
Antares erect-image finder and a Telrad reflex-type
finder are also mounted on the
C-11 tube assembly.
10/15/2012: A view of the HyperStar f/2 imaging
system mounted on the corrector lens of the
C-11
along with the Starlight Express SXVR-H694C
6 megapixel one-shot color CCD camera. Using
this system, the f/10
C-11 becomes an f/2, with a
focal length of 560mm yielding an imaging field of
77 X 61 arc minutes and a resolution of 1.67 arc
seconds per pixel. This camera uses the super
sensitive
SONY ICX694 detector with 4.5 micron
pixels and set-point thermo-electric cooling. Shown
to the left of the
C-11 tube assembly is the ORION
ED80
80mm (3.1") guiding refractor. With a focal
length of 600mm and the
ORION StarShoot auto
guider, it has a resolution of 1.79 arc seconds per
pixel. This scope is mounted co-axially using
Losmandy heavy duty dovetails and 150mm heavy
duty rings. This setup is very rigid and has shown
NO evidence of differential flexure, even during 11
minute exposures. Also shown in this view is the
massive, conical Polar axis of the
MI-250 mount.
SETTING UP FOR A NIGHT OF
IMAGING AT LAND OF OZ:
This photo was taken by my good
friend Dave Hudgins in July of 2018.
Shown are the Celestron 11-inch
telescope on the Mountain Instruments
MI-250 mount, along with the 80mm
APO refractor guiding scope and the
Starlight Express SXVR-H694C camera
mounted on the HyperStar imaging
adapter.
A Bahtinov mask has been mounted on
the corrector plate in preparation for
fine focusing the camera.
This setup has been my primary
astro-imaging rig for the past 5 years.
Results from this rig appear on the
CCD Images page of this website.
Thanks, Dave, for this great photo!
The Photo to the Far Right is a close-up
view of the
Micro-Touch Stepper Motor
Focuser
and the cable connecting it to the
remote controller in the
Control Room.
NEAR RIGHT: View of the optical tube of
the
C-11 showing the ORION ED-80 guide
scope and
StarShoot auto guider mounted
via
LOSMANDY heavy duty dovetails and
rings. Also shown is the
Micro-Touch
stepper motor focuser for the 11-inch f/2
main mirror. This stepper motor turns the
focus screw
1/3000th of a revolution per
step, providing very precise focus
adjustments. It is connected to a focuser
hand control located in the adjacent
Control Room via an under-floor cable.
The
StarShoot auto guider sends guiding
corrections to the
MI-250 mount using
guiding software in the
MAXIM DL-5
camera control software.