By James Mullaney
This is often an exceptional e-book for me. i'm studying approximately astronomy/stargazing, and likewise trying to find recommendation on the subject of paying for my first telescope. The booklet is vastly supporting me to raised decide upon my first telescope. The booklet additionally comprises information regarding add-ons for telescopes and binoculars, it additionally comprises quite a lot of data on astronomy. i'm joyful that i bought this e-book.
Read or Download A Buyer's and User's Guide to Astronomical Telescopes & Binoculars (Patrick Moore's Practical Astronomy Series) PDF
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Additional resources for A Buyer's and User's Guide to Astronomical Telescopes & Binoculars (Patrick Moore's Practical Astronomy Series)
Indeed, the famed 200-inch Hale reﬂector at Palomar was the last of the giant professional telescopes to be mounted equatorially. All the world’s great research instruments today – including the huge Keck 400-inch binocular telescope in Hawaii – are computerized altazimuths, greatly reducing the size, weight, and cost of their mountings, as well as of the observatories housing them. The commercial telescope market has quickly followed suit, offering observers the option of light-weight computer-driven altazimuths in place of traditional equatorial mountings.
This form uses an elliptical primary and a spherical secondary mirror, which are easier to ﬁgure than those in a standard Cassegrain, thus accounting for its popularity among amateur telescope makers. Its long effective focal ratios (typically f/12 or more) are great for lunar and planetary observing, but the system suffers from coma and noticeable curvature of ﬁeld. Dall–Kirkhams are not widely available on the commercial telescope market, but one source is Takahashi. Its Mewlon series offers 7-inch, 8-inch, and 10-inch models at hefty prices running between $5,000 and $10,000.
From the standpoints of light-gathering ability, resolution, magniﬁcation, atmospheric turbulence, optical cool-down time, portability, and cost, I believe that a telescope somewhere in the 4- to 8-inch aperture range is perhaps optimum for general stargazing purposes. Many observers wisely opt for having a small portable instrument (often their initial purchase) combined with a much larger but less portable one, giving them the best of both worlds. In this case, a rich-ﬁeld telescope (or RFT) such as those discussed in Chapters 4 and 5 is a good choice for the former.
A Buyer's and User's Guide to Astronomical Telescopes & Binoculars (Patrick Moore's Practical Astronomy Series) by James Mullaney