By Mollise Rod
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Extra resources for The Urban Astronomer's Guide
Example text
That means that in addition to blocking the light from the ground, your filter also blocks the light from the stars. Because of this, we can immediately eliminate light-pollution filters as a tool for viewing galaxies. Galaxies are composed of stars, and their light is attenuated by filters. Forget other stellar subjects—open and globular star clusters—too. So why waste your money on an LPR filter (they sell for about 100 US$ or 100 UKP)? What good are they? They won’t do a thing for clusters and galaxies, but LPR filters can work spectacularly well for diffuse and planetary nebulae.
This is a nice feature for urban observers, and one I’m surprised other dob makers have not picked-up on. Equatorially Mounted Newtonians There was a time when it looked as if Newtonian reflectors mounted on German equatorial mountings (GEMs) were as an endangered species as the refractor. Only a few were found for sale, and many of these were in the premium-price category. This style of telescope hadn’t changed with the times, either. Heavy (but not overly steady) mounts were the order of the day and discouraged amateurs who needed to move the scope around the yard or down flights of stairs from considering one.
The truss tube telescope design (see Plate 4) is the current darling of Dobsonian users. In addition to a rocker box mount like those of the Sonotube dobs, it consists of a mirror box that holds the primary mirror, truss poles that take the place of a solid tube, and an upper cage assembly that carries the secondary mirror and focuser. The purpose of this design is to make large-aperture Dobsonians practical—these big scopes can be easily broken down into manageable components for transport. Keep in mind, though, that even the mirror box of a large truss tube telescope will be impossible for many apartment dwellers to manage.