In the final instalment detailing the altazimuth mount
and slow motions (see Figure 5, published on 1905 July 28) he makes the comment: Not having any workshop, I was unable to do the work myself, and had to rely on the ability and intelligence of the local blacksmith and carpenter.
* Many of today's telescopes have motor-driven altazimuth mounts
that keep them pointed at celestial objects as they move from east to west across the sky.
The Vixen package in this review consists of two components: the R130Sf 5-inch, f/5 optical tube assembly (OTA), and the Porta II altazimuth mount
. (Either can be purchased separately.) The OTA is nicely finished and features all-metal construction, with the exception of the focuser, which is mostly plastic.
Until recently, it was impossible to motorize an altazimuth mount
to track the sky automatically.
The Megrez 90 is light enough to work well with small altazimuth mounts
such as the William Optics Eazy-Touch or the Stellarvue M1.
Basic altazimuth mounts
can certainly be used for astronomical observation, but you may be frustrated by the continual need to make simultaneous manual corrections for two axes.
move up and down and left and right, just like a camera tripod.
(The rover cameras are on simple altazimuth mounts
atop masts; tracking the sky was never something that we planned for.) These star-trail images are lovely, but a careful look reveals that the stars don't travel across the Martian sky the same way that they move above Earth.
are generally lighter than their equatorial counterparts, in part because they don't require counterweights to balance the telescope.
While equatorial mounts come in an amazing variety of sizes and price ranges, it's hard to overlook the fact that the same isn't true for their more basic brethren, altazimuth mounts
. Suppose you don't need motorized tracking and really don't want to cart around several pounds of counterweight when you just want to sweep the Milky Way or take a quick peek at the Moon or Saturn?
Existing digital setting circles, GPS receivers, and electronic compasses can provide all the needed input for instruments that ride on electronically controlled altazimuth mounts
. As the associated technologies mature, standalone HUD capability will be fully integrated into binoculars, which will need to accurately sense free-floating azimuth, elevation, and other parameters.
I found the StarBlast vastly easier to move about the sky than the commonplace altazimuth mounts
that regulate altitude with threaded metal rods and side-to-side motion with wobbly, undersize couplings.
(Newer computer-controlled Go To telescopes on altazimuth mounts
can automatically track objects, but to obtain long exposures without field rotation, you need to use an expensive accessory called a field derotator.)