Sky and Telescope - December 2016 - 60

S&T Test Report
conventional mirror cells with three large knurled collimation knobs and three narrower but longer locking
knobs. Both have center-spotted mirrors, making them
very easy to collimate if you purchase or build an appropriate collimation device. (See skyandtelescope.com/
astronomy-resources/collimation-tools/.) But the instructions in the manual for collimating a telescope without
such a device are confusing at best.
Baby's primary mirror is glued directly to the back of
the tube, with no provision for collimation. The scope
could in theory be collimated by tilting the secondary
mirror, but this would be difficult because the primary
mirror has no center spot.

Baby Scope
The LightBridge Mini 82 has an 82-mm primary mirror,
as its name implies. The mirror is extremely fast (f/3.7)
and has a spherical rather than paraboloid surface,
which guarantees that it cannot deliver sharp images at
high magnifications.
Despite its spherical mirror, Baby provides pretty
good low- and medium-power views when used with the
MA (modified achromat) eyepieces supplied with Mama
and Papa. Unfortunately, although Baby's eyepieces
have the same focal lengths as Mama's and Papa's,
they are Huygenians, an inexpensive design that works
particularly poorly in scopes with short focal ratios. The
Huygenians have apparent fields of view of just 30°°, compared with 50° for the MAs, and they're only reasonably
sharp in the central 10°. Even so, Baby provides acceptable views of large star clusters such as the Pleiades and
Beehive, and like any half-decent telescope, it shows a
wealth of detail on the Moon.

Although the 26-mm Huygenian has a narrow apparent field of view, its 11.5× magnification is so low that it
provides a big 2.6° true field of view. That makes it very
easy to locate your target with the red-dot finder. And
once located, targets are very easy to track; the simple
tabletop mount is amply smooth and sturdy for such a
tiny optical tube.
The scope's biggest liability is that it's very hard to
coax decent planetary views out of it. The 9-mm Huygenian provides 33×, enough to show that the planets are
extended disks rather than simple points of light and
to show four moons of Jupiter and one moon of Saturn.
But 33× doesn't quite show Jupiter's two main belts or
separate Saturn's rings cleanly from the disk. For that
you need to use the supplied Barlow lens, which shows
extreme false color everywhere except in the center of
the field of view. The net effect is that you can indeed
see Jupiter's main belts and Saturn's rings, but only if
you use the 9-mm eyepiece together with the Barlow and
make sure to keep the planet in the very center of the
field of view.

Mama Scope
and Papa
Scope have
three large
collimation
screws and
three locking
screws.

All three
scopes
include three
collimation
screws to
adjust the
secondary
mirror position.

Baby Scope attaches directly to the mount at left, but Papa and Mama
have dovetail bars that make it easy to detach and/or balance the tubes.

60

December 2016 sky & telescope


http://www.skyandtelescope.com/astronomy-resources/collimation-tools/ http://www.skyandtelescope.com/astronomy-resources/collimation-tools/

Sky and Telescope - December 2016

Table of Contents for the Digital Edition of Sky and Telescope - December 2016

Contents
Sky and Telescope - December 2016 - Cover1
Sky and Telescope - December 2016 - Cover2
Sky and Telescope - December 2016 - 1
Sky and Telescope - December 2016 - Contents
Sky and Telescope - December 2016 - 3
Sky and Telescope - December 2016 - 4
Sky and Telescope - December 2016 - 5
Sky and Telescope - December 2016 - 6
Sky and Telescope - December 2016 - 7
Sky and Telescope - December 2016 - 8
Sky and Telescope - December 2016 - 9
Sky and Telescope - December 2016 - 10
Sky and Telescope - December 2016 - 11
Sky and Telescope - December 2016 - 12
Sky and Telescope - December 2016 - 13
Sky and Telescope - December 2016 - 14
Sky and Telescope - December 2016 - 15
Sky and Telescope - December 2016 - 16
Sky and Telescope - December 2016 - 17
Sky and Telescope - December 2016 - 18
Sky and Telescope - December 2016 - 19
Sky and Telescope - December 2016 - 20
Sky and Telescope - December 2016 - 21
Sky and Telescope - December 2016 - 22
Sky and Telescope - December 2016 - 23
Sky and Telescope - December 2016 - 24
Sky and Telescope - December 2016 - 25
Sky and Telescope - December 2016 - 26
Sky and Telescope - December 2016 - 27
Sky and Telescope - December 2016 - 28
Sky and Telescope - December 2016 - 29
Sky and Telescope - December 2016 - 30
Sky and Telescope - December 2016 - 31
Sky and Telescope - December 2016 - 32
Sky and Telescope - December 2016 - 33
Sky and Telescope - December 2016 - 34
Sky and Telescope - December 2016 - 35
Sky and Telescope - December 2016 - 36
Sky and Telescope - December 2016 - 37
Sky and Telescope - December 2016 - 38
Sky and Telescope - December 2016 - 39
Sky and Telescope - December 2016 - 40
Sky and Telescope - December 2016 - 41
Sky and Telescope - December 2016 - 42
Sky and Telescope - December 2016 - 43
Sky and Telescope - December 2016 - 44
Sky and Telescope - December 2016 - 45
Sky and Telescope - December 2016 - 46
Sky and Telescope - December 2016 - 47
Sky and Telescope - December 2016 - 48
Sky and Telescope - December 2016 - 49
Sky and Telescope - December 2016 - 50
Sky and Telescope - December 2016 - 51
Sky and Telescope - December 2016 - 52
Sky and Telescope - December 2016 - 53
Sky and Telescope - December 2016 - 54
Sky and Telescope - December 2016 - 55
Sky and Telescope - December 2016 - 56
Sky and Telescope - December 2016 - 57
Sky and Telescope - December 2016 - 58
Sky and Telescope - December 2016 - 59
Sky and Telescope - December 2016 - 60
Sky and Telescope - December 2016 - 61
Sky and Telescope - December 2016 - 62
Sky and Telescope - December 2016 - 63
Sky and Telescope - December 2016 - 64
Sky and Telescope - December 2016 - 65
Sky and Telescope - December 2016 - 66
Sky and Telescope - December 2016 - 67
Sky and Telescope - December 2016 - 68
Sky and Telescope - December 2016 - 69
Sky and Telescope - December 2016 - 70
Sky and Telescope - December 2016 - 71
Sky and Telescope - December 2016 - 72
Sky and Telescope - December 2016 - 73
Sky and Telescope - December 2016 - 74
Sky and Telescope - December 2016 - 75
Sky and Telescope - December 2016 - 76
Sky and Telescope - December 2016 - 77
Sky and Telescope - December 2016 - 78
Sky and Telescope - December 2016 - 79
Sky and Telescope - December 2016 - 80
Sky and Telescope - December 2016 - 81
Sky and Telescope - December 2016 - 82
Sky and Telescope - December 2016 - 83
Sky and Telescope - December 2016 - 84
Sky and Telescope - December 2016 - Cover3
Sky and Telescope - December 2016 - Cover4
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