Sky and Telescope - November 2016 - 62

S&T Test Report
Optical performance of the SVA-130T is designed
to be stable as the temperature drops, because the
construction of the steel lens cell closely matches the
expansion coeﬃcient of the objective. The Feather Touch
focuser was superlative with absolutely no image shift or
slop when focusing.
A star test revealed a perfectly circular and symmetrical pattern with similar brightness on both sides of focus.
The Fresnel pattern was slightly mushy outside of focus,
but I have seen this even in the best refractors; what truly
matters is what the star looks like when in focus. There
was no spurious color at focus on brilliant Vega, and there
were no signs of astigmatism, spherical aberration, or
spherochromatism. I didn't detect any light scatter in the
shadows of craters on the Moon, nor anywhere in the ﬁeld
when the Moon was placed slightly outside of the ﬁeld of
view - a testament to the scope's excellent baﬄing.
Top: Switching between visual and photographic conﬁgurations requires removing the focuser and the 110-mm-diameter
threaded extension tube, replacing the focuser, and then adding
the SFFR.72-130 large-format ﬁeld ﬂattener/focal reducer, followed
by your camera's adapter. Bottom: The ruggedly constructed
C130HD hard case made from PVC-laminated 3/8-inch plywood
with metal-reinforced corners and edges is available for an
additional $300. The case is lined with custom-ﬁtted foam and
includes caster wheels, weighing in at a hefty 28.6 pounds.

Images captured through the SVA-130T, such as this ﬁeld in Ophiuchus - including the dark nebulae B72, the Snake Nebula (right) -
displayed well-corrected stars nearly to the corners of a 24-by-36-mm detector.

62

November 2016 sky & telescope

Sky and Telescope - November 2016

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

Contents
Sky and Telescope - November 2016 - Cover1
Sky and Telescope - November 2016 - Cover2
Sky and Telescope - November 2016 - 1
Sky and Telescope - November 2016 - Contents
Sky and Telescope - November 2016 - 3
Sky and Telescope - November 2016 - A
Sky and Telescope - November 2016 - B
Sky and Telescope - November 2016 - 4
Sky and Telescope - November 2016 - 5
Sky and Telescope - November 2016 - 6
Sky and Telescope - November 2016 - 7
Sky and Telescope - November 2016 - 8
Sky and Telescope - November 2016 - 9
Sky and Telescope - November 2016 - 10
Sky and Telescope - November 2016 - 11
Sky and Telescope - November 2016 - 12
Sky and Telescope - November 2016 - 13
Sky and Telescope - November 2016 - 14
Sky and Telescope - November 2016 - 15
Sky and Telescope - November 2016 - 16
Sky and Telescope - November 2016 - 17
Sky and Telescope - November 2016 - 18
Sky and Telescope - November 2016 - 19
Sky and Telescope - November 2016 - 20
Sky and Telescope - November 2016 - 21
Sky and Telescope - November 2016 - 22
Sky and Telescope - November 2016 - 23
Sky and Telescope - November 2016 - 24
Sky and Telescope - November 2016 - 25
Sky and Telescope - November 2016 - 26
Sky and Telescope - November 2016 - 27
Sky and Telescope - November 2016 - 28
Sky and Telescope - November 2016 - 29
Sky and Telescope - November 2016 - 30
Sky and Telescope - November 2016 - 31
Sky and Telescope - November 2016 - 32
Sky and Telescope - November 2016 - 33
Sky and Telescope - November 2016 - 34
Sky and Telescope - November 2016 - 35
Sky and Telescope - November 2016 - 36
Sky and Telescope - November 2016 - 37
Sky and Telescope - November 2016 - 38
Sky and Telescope - November 2016 - 39
Sky and Telescope - November 2016 - 40
Sky and Telescope - November 2016 - 41
Sky and Telescope - November 2016 - 42
Sky and Telescope - November 2016 - 43
Sky and Telescope - November 2016 - 44
Sky and Telescope - November 2016 - 45
Sky and Telescope - November 2016 - 46
Sky and Telescope - November 2016 - 47
Sky and Telescope - November 2016 - 48
Sky and Telescope - November 2016 - 49
Sky and Telescope - November 2016 - 50
Sky and Telescope - November 2016 - 51
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Sky and Telescope - November 2016 - 53
Sky and Telescope - November 2016 - 54
Sky and Telescope - November 2016 - 55
Sky and Telescope - November 2016 - 56
Sky and Telescope - November 2016 - 57
Sky and Telescope - November 2016 - 58
Sky and Telescope - November 2016 - 59
Sky and Telescope - November 2016 - 60
Sky and Telescope - November 2016 - 61
Sky and Telescope - November 2016 - 62
Sky and Telescope - November 2016 - 63
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Sky and Telescope - November 2016 - 65
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Sky and Telescope - November 2016 - 73
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Sky and Telescope - November 2016 - 81
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Sky and Telescope - November 2016 - 84
Sky and Telescope - November 2016 - Cover3
Sky and Telescope - November 2016 - Cover4
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