Sky and Telescope - July 2018 - 73
p Doug's homemade focusers are equally
simple and elegant.
This beautiful image of the Orion Nebula was captured by
noted astrophotographer Tony Hallas with a 35mm-format QHY128C color camera. No ﬁlter
wheel, no ﬁlters, just 3x20 min. exposures. "This thing is so sensitive it could record a ﬁreﬂy."
QHTCCD makes more than 50 models of CCD and CMOS cameras starting at $99. For a list of
QHYCCD Premier U.S. Dealers and a free 50+ page catalog, visit www.qhyccd.com/USA
DFM Engineering, Inc.
1035 Delaware Ave., Unit D
Longmont, CO USA 80501
■ Contributing Editor JERRY OLTION,
designer and builder of the trackball
telescope, says "Once you track, you'll
never go back."
photo: NASA, ESA, and the Hubble Heritage Team (STScl/AURA) ESA/Hubble Collaboration
it slowly unwinds the clutch knob and
Doug's telescopes have as many
homemade parts as possible, from the
primary mirrors to the spiders, mirror
mounts, ﬁnders, and focusers. The
focusers in particular show his simple,
straightforward approach to telescope
making. They're rock-solid Crayfords,
with slow motion provided by worm
gears and fast motion provided by a
crank that lets you turn the worm gear
His scopes are housed in an equally
beautiful roll-off-roof observatory near
the Pemigewasset Wilderness in New
Hampshire's White Mountains, one of
the few dark-sky sites in the East.
Doug loves observing with his
bowling ball-mounted scopes. Of the
experience, he says, "Not an axis to be
seen in my observatory! I love the fact
that pointing any of these telescopes is
easy, the eyepiece is always at a convenient angle - and can easily be lowered
for the less height-advantaged among
us - and that the telescopes are stable
and nearly vibration free. I have numerous ATM friends who, having made or
acquired mirrors, have tried my telescopes and exclaimed 'Oh, can I have a
mount like that?!'"
Indeed you may. Dig that old bowling
ball out of the closet and get to work.
For more information, contact Doug
Upgrades / Repairs
Observatory Design Consulting
s k y a n d t e l e s c o p e . c o m * J U LY 2 0 1 8