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By E.H. Dowell
Ebook by means of Dowell, E.H.
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Refractors, covered here ﬁrst, were the original type of the telescope. They are regaining their former great popularity as instruments for both beginning and advanced amateur astronomers. If visual study of the mysterious objects of the deep sky – galaxies, faint nebulae and dark structures – appeals to you as the most exciting realm for exploration, an economical reﬂecting telescope is likely the ideal ﬁrst instrument. If photography and imaging is your aim, catadioptric or “cat” telescopes provide unique advantages beyond economical aperture.
This is good advice indeed, since observing with binoculars is pure fun, and can be a challenging activity. Back in 1985 I knew enough about glass to realize the old 7 × 35 Bushnells I had on hand were probably sadly inadequate for the task of spotting an 8th magnitude Comet P/Halley near the Pleiades long before perihelion. Still, I persevered, lying on the tar-sticky road (the only open sky near my house at the time) and brushing away mosquitoes. Acquiring the tiny mothball of Halley’s in the sky two nights in a row with that beat-up old pair of binos (and noting that it had changed position), still rates as one of the best feelings I’ve ever had in astronomy.
This is quite an increase in apparent size! Yet, this amount of magniﬁcation resides at the low end of the scale normally used for planetary observation. ” It may not have occurred to everyone that this silliness reduces the apparent diameter of the object viewed by an exact factor. 8 mm) focal length Care of Astronomical Telescopes and Accessories 18 makes the object appear six times (6×) larger. Reverse viewing reduces the apparent size by exactly this much. This holds true whether the eye lens is positive as in an astronomical telescope, or negative as in a Galilean telescope.