Sky & Telescope - October 2020 - 67

ing in polar alignment to avoid possible
changes due to flexure when weight is
added or removed from a mount.
Sky-Watcher does not give a value
for periodic error of the approximately
7-inch diameter, 435-tooth right-ascension worm gear. But I measured the
error to be less than 6 arcseconds one
night when viewing double stars with a
calibrated reticle eyepiece. The tracking was very smooth and free of sudden
jumps that might compromise guiding. I
made several dozen 10-minute autoguided exposures without a single one
showing guiding errors. And all but a
few of my dozens of 2-minute unguided
exposures were successful. I have no
doubts that the mount will meet the
demands of today's deep-sky photographers guiding manually (does anyone
still do that?) or with an autoguider.
For people wanting to push the limits
of unguided exposures, the EQ8-R Pro
is available with a high-resolution Renishaw encoder on the right-ascension
axis that should reduce periodic error
well into the sub-arcsecond range. It's a
$3,050 option.

Cables and Electronics
The EQ8-R Pro has an internal cablemanagement system for equipment
mounted on a telescope. This can eliminate most loose wires hanging from a
telescope that could snag on a moving
mount. There are input ports on the
fi xed end of the polar-axis housing for

S The author made this view of the Christmas Tree Cluster and Cone Nebula in Monoceros with a
200-mm f/3 astrograph and CCD camera. It was assembled from a dozen 10-minute autoguided
exposures with the EQ8-R Pro mount.

power, USB 3.0 (connected to an internal USB hub), and RJ10, RJ12, and RJ45
modular jacks (the RJ45 jack is for 8-pin
Ethernet cables). On the sky end of the
telescope saddle there are three power
output ports and four powered USB 3.0
ports, while the other end of the saddle
has the corresponding output ports for
the modular jacks.
As nice as this cable-management
system is for electronic equipment

on a telescope, the EQ8-R Pro does
require some wires to be attached to the
declination-axis housing, which is fi xed
relative to telescope moving in declination and also moves as the polar axis
rotates. These are for the mount's main
power input, SynScan hand control,
autoguider input, and a USB cable if you
want a hard-wire connection between
the mount and a computer. Recently
Sky-Watcher introduced a $65 WiFi

S Left: The mount's polar alignment can be precisely adjusted with heavy-duty controls on the azimuth and altitude motions of the polar axis. Right:
While the EQ8-R Pro has an optional polar-alignment scope available, the author used its mounting cap screws to attach his QHYCCD PoleMaster to
electronically dial in the mount's alignment.
sk yandtelescope.org * OCTOBER 2 02 0

67


http://www.skyandtelescope.org

Sky & Telescope - October 2020

Table of Contents for the Digital Edition of Sky & Telescope - October 2020

Contents
Sky & Telescope - October 2020 - Cover1
Sky & Telescope - October 2020 - Cover2
Sky & Telescope - October 2020 - 1
Sky & Telescope - October 2020 - Contents
Sky & Telescope - October 2020 - 3
Sky & Telescope - October 2020 - 4
Sky & Telescope - October 2020 - 5
Sky & Telescope - October 2020 - 6
Sky & Telescope - October 2020 - 7
Sky & Telescope - October 2020 - 8
Sky & Telescope - October 2020 - 9
Sky & Telescope - October 2020 - 10
Sky & Telescope - October 2020 - 11
Sky & Telescope - October 2020 - 12
Sky & Telescope - October 2020 - 13
Sky & Telescope - October 2020 - 14
Sky & Telescope - October 2020 - 15
Sky & Telescope - October 2020 - 16
Sky & Telescope - October 2020 - 17
Sky & Telescope - October 2020 - 18
Sky & Telescope - October 2020 - 19
Sky & Telescope - October 2020 - 20
Sky & Telescope - October 2020 - 21
Sky & Telescope - October 2020 - 22
Sky & Telescope - October 2020 - 23
Sky & Telescope - October 2020 - 24
Sky & Telescope - October 2020 - 25
Sky & Telescope - October 2020 - 26
Sky & Telescope - October 2020 - 27
Sky & Telescope - October 2020 - 28
Sky & Telescope - October 2020 - 29
Sky & Telescope - October 2020 - 30
Sky & Telescope - October 2020 - 31
Sky & Telescope - October 2020 - 32
Sky & Telescope - October 2020 - 33
Sky & Telescope - October 2020 - 34
Sky & Telescope - October 2020 - 35
Sky & Telescope - October 2020 - 36
Sky & Telescope - October 2020 - 37
Sky & Telescope - October 2020 - 38
Sky & Telescope - October 2020 - 39
Sky & Telescope - October 2020 - 40
Sky & Telescope - October 2020 - 41
Sky & Telescope - October 2020 - 42
Sky & Telescope - October 2020 - 43
Sky & Telescope - October 2020 - 44
Sky & Telescope - October 2020 - 45
Sky & Telescope - October 2020 - 46
Sky & Telescope - October 2020 - 47
Sky & Telescope - October 2020 - 48
Sky & Telescope - October 2020 - 49
Sky & Telescope - October 2020 - 50
Sky & Telescope - October 2020 - 51
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Sky & Telescope - October 2020 - 53
Sky & Telescope - October 2020 - 54
Sky & Telescope - October 2020 - 55
Sky & Telescope - October 2020 - 56
Sky & Telescope - October 2020 - 57
Sky & Telescope - October 2020 - 58
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Sky & Telescope - October 2020 - 60
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Sky & Telescope - October 2020 - 68
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Sky & Telescope - October 2020 - 79
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Sky & Telescope - October 2020 - Cover3
Sky & Telescope - October 2020 - Cover4
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