Re: Zoom astro telescope with good optics
- From: W. H. Greer <sendnomail@xxxxxxxx>
- Date: Wed, 13 Dec 2006 15:00:32 -0700
"James Harris" <james.harris.1@xxxxxxxxxxxxxx> wrote:
Is there such a thing as an astroscope with zoom? To minimise shake the
zoom would have to be on a decoupled wheel (preferred) or electric. It
would be a great way to navigate around the sky and to close-in on
binaries, especially multicoloured ones such as Albireo.
Hi James,
As Brian pointed out, zoom eyepieces are available. Such eyepieces
are manually adjusted and are the closest option to an astronomical
telescope with zoom. (It may be only a matter of time before
electrically controlled zooms become readily available.)
For navigational purposes wider true fields (than can be had with
typical zoom eyepieces) can be achieved with an appropriate,
low-power, wide-field eyepiece. I find eyepiece swapping to be more
effective for navigating and "zooming in" than the use of a zoom
eyepiece. Such swapping gives me better control over field size, a
wider range of magnifications (higher highs and/or lower lows), as
well as control over other issues relating to eyepiece quality.
When a telescope is shaky, the problem almost always lies with the
telescope's mount and/or tripod. For an astronomical telescope that
is adequately mounted it's usually possible to swap one eyepiece for
another with very little or no noticeable shaking.
--
Bill
Celestial Journeys
http://cejour.blogspot.com
.
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