Sky and Telescope - November 2018 - 69

p Not a single one of the thirty 10-minute exposures used to create this view of the small emission nebula Sh2-112 west of Deneb in Cygnus was
rejected because of poor tracking with the CEM120 setup pictured on page 67.

of 1 ampere each, and all derive their
power from the same 12-VDC source
that powers the mount. There's another
pair of ports rated for up to 5 amperes
DC each that connect to a single port
on the Input Panel. The voltage for these
is simply determined by whatever you
feed into the port on the Input Panel,
and this is very useful if you have
equipment that runs on special power
sources such as 24 or 48 volts. Lastly,
there's a single port with DIN-422 connectors on the saddle and Input Panel.
This is the same connector used for the
power source for Finger Lakes Instrumentation's CCD cameras.
While this cable-management
system can likely handle any imaging
setup that I can think of, it may require
custom cables to make it a plug-andplay setup. For example, I needed short
cables with male coaxial plugs on each
end to feed power from the saddle
ports to the inputs of my CCD camera

and autoguider. And this will be true
of most equipment that you'll want to
power from these ports.

Performance
One word can summarize the performance I experienced with the CEM120
- flawless. Everything worked perfectly.
The mount proved to be solid, quiet, and
reliable for visual and imaging applications. The picture of Sh2-112 above
is a good example of the CEM120's
performance as an imaging platform.
Captured with the 14-inch Meade
operating at a focal length of 3,375 mm,
it's a stack of thirty 10-minute exposures made on two consecutive nights.
Not a single image had to be rejected
because of poor tracking. Indeed, of the
dozens of exposures I made of various
objects during my testing, none was ever
degraded by tracking errors.
As with most Go To mounts, the
CEM120 can be parked and later

resume observing without having to be
re-initialized to the sky. But the mount
can also be sent to a so-called Zero
Position from a "cold" start (or after
interruptions such as power failures
or computer crashes). This position is
accurate enough to allow resuming
operations without a person having
to be present at the mount. And that's
key for any mount intended for remote
operation. While my testing was always
done with me sitting only a few feet
from the mount, I could easily have
been half a world away.
The CEM120 continues iOptron's
track record of developing innovative
telescope mounts that offer lots of
performance relative to their cost - in
other words, mounts that are a great
value in today's marketplace.
■ DENNIS DI CICCO has been covering
astronomical equipment in the pages of
Sky & Telescope for 45 years.
sk yandtelescope.com * N OV E M B E R 2 018

69



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Sky and Telescope - November 2018

Table of Contents for the Digital Edition of Sky and Telescope - November 2018

Contents
Sky and Telescope - November 2018 - Cover1
Sky and Telescope - November 2018 - Cover2
Sky and Telescope - November 2018 - 1
Sky and Telescope - November 2018 - Contents
Sky and Telescope - November 2018 - 3
Sky and Telescope - November 2018 - 4
Sky and Telescope - November 2018 - 5
Sky and Telescope - November 2018 - 6
Sky and Telescope - November 2018 - 7
Sky and Telescope - November 2018 - 8
Sky and Telescope - November 2018 - 9
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