Sky & Telescope - July 2021 - 70

S&T Test Report

S Autoguiding with the iGuider and PHD2 locked on to the star Alcyone in the Pleiades star cluster

half the images in a 25-frame sequence,
though guiding with the CEM70G was
very accurate when I switched to an offaxis guider and camera instead.

Summing It All Up
The CEM70G is a mid-sized equatorial
mount best suited to fast astrographs
and catadioptrics of up to about 11-inch

aperture. This accurate, versatile, and
rugged mount will perform impressively
whether it's set up in the field before
each use or is permanently mounted
in an observatory. Its onboard guiding
capability with the guidescope's 120mm focal length is accurate enough for
imaging with instruments having focal
lengths up to about 1,000 mm. And

its built-in, 3-port USB 3.0 hub significantly reduces the number of cables
running to your control computer. With
the CEM70G, iOptron continues its
history of innovative solutions to the
challenges of astrophotography.

„ After decades of using non-Go To
mounts, Contributing Editor JOHNNY
HORNE is finally attempting to modernize his 43-year-old observatory.

S Left: This image of the Horsehead Nebula region in Orion was guided using iGuider and PHD2. A total of 50, 2-minute exposures made with a ZWO
ASI294C camera and 8-inch Celestron Rowe-Ackermann Schmidt Astrograph were stacked together to produce this colorful, perfectly guided result.
Right: Long-focal-length instruments require an external guider and guidescope or off-axis guider when imaging on the CEM70G. With its focal length
of 1,625 mm, the author's 8-inch Ritchey-Chrétien proved too much for the iGuider, though the mount easily tracked this image of M78 with the aid of
an off-axis guider and additional autoguider.

70

J U LY 2 0 2 1 * S K Y & T E L E S C O P E



Sky & Telescope - July 2021

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