Some additional information about Nugent's system from D. Dunham
The power supply that Nugent describes under "disadvantages"
of other systems can be simplified. A power inverter that can
handle 150 Watts from a car battery/autoplug can be purchased for
about $70 and weigh only 2-3 pounds, much more manageable than
the 15-lb. system mentioned by Ricard. However, these inverters
are noisy, causing static on your short-wave radio, if that's
what you use for accurate time signals such as WWV. It's difficult
to shield these inverters to decrease that static. Also, if you
use your car battery to power equipment for more than a few
minutes, take care to avoid being stranded with a dead battery,
by perhaps leaving the engine running (but that introduces more
noise). Some observers use marine batteries, the 5.6-amp-h
Portapac batteries, etc., to power their equipment.
Another alternative to the Sharp camcorder, and at least
half the price, is the battery-powered VCR-TV combination units
that are popular now with campers. Like a camcorder, you don't
need extra connections. And these will run off of your car battery,
so you don't need a noisy inverter, as described above. But
these VCR-TV combo units are rather large, usually having 9-inch
screens. That's good for the view, for seeing what you're
recording. Although these can be easily transported in a car,
they are too large for airplane travel; if you want to do that,
then the Sharp camcorder is the most cost-effective solution
that I know of.
I recently purchased a Sharp VL-AH13LU camcorder myself,
but I could not find any dealer locally who had one, and had to
go to the Web, using a "best cost" search engine to find one
selling for $300. Unfortunately, manufacturers seem to now
be concentrating on the more expensive digital camcorders, and
the Sharp camcorders will probably become increasingly
difficult to find. So if you want to duplicate Nugent's
system, at least this part of it, then I suggest that you
act quickly.
Nugent recommends an f/6.3 focal reducing lens, but for
just a little more, about $150 from Focus Camera (and probably
similar from some other Meade dealers), you can buy an f/3.3
focal reducing lens that will give you about 4 times the
area, and almost a magnitude more sensitivity, than the more
common f/6.3 focal reducing lens. The f/3.3 lens, built by
Meade only for CCD and video systems, can not be used for
visual observation, like the f/6.3 lens. But for video, the
advantages are great.
Nugent recommends either the T-mount and C-mount adapters
available from Orion and other dealers, or a specially-made
adapter that shortens the system (I think that increases
the field of view and sensitivity a little). But a version
of the latter can be purchased from Adirondack Video for
about $35, a C-to-1.25-inch eyepiece holder so the camera
can be easily fitted into any eyepiece holder with just one
small (just over an inch long) cylinder adapter. Some don't
like it because the end of the adapter hits a focal reducing
lens (if one is used, and we recommend it, see above) if it
is fitted all the way into the eyepiece holder. In practice,
I haven't seen a problem with that, and it can be avoided by
not sliding the adapter all the way in.
David Dunham
Return to the
Main Index