By Stephen Tonkin
This ebook comprises every little thing an astronomer must find out about binocular gazing. The e-book takes an in-depth examine the tools themselves. It has sections on comparing and purchasing binoculars and binocular telescopes, their care, mounting, and components. moreover there's a choice of fifty high quality items to be obvious with 50mm and 100mm binoculars. the benefits of utilizing either eyes for astronomical looking at are many and substantial, mostly end result of the approach the human mind techniques visible info. This publication allows the astronomer to maximise these benefits.
Read or Download Binocular Astronomy (Patrick Moore's Practical Astronomy Series) PDF
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Additional info for Binocular Astronomy (Patrick Moore's Practical Astronomy Series)
Example text
Bush in the distal end of the center-post. This bush is covered by a cap, usually made of plastic, but sometimes of metal, which unscrews. Remove it and check the quality of the bush. If possible, try an L-bracket and ensure that you can easily connect the bracket to the binocular, with the thread of the L-bracket bolt easily meshing with the thread in the bush without danger of cross-threading. Remember that you will most likely be wanting to do this in the dark, possibly with cold or gloved hands.
Run the focus mechanism through its full range. The feel should be uniform throughout the range and should not be too stiff or too loose. If it is stiff, it is very difficult to find a precise focus. If it is loose, it is difficult to maintain a good focus. Feel for any stiff regions or any “sloppy” regions. A different feel in different regions is indicative of poor mechanical tolerances in manufacture. Feel for any difference between dynamic friction and static friction (“stiction”) by stopping the focus at various points throughout the focal range and feeling for a slight jerk or “catch” when you start to refocus.
Differences in optical quality can often be immediately apparent, even to “untrained” people, most of whom are capable of performing simple tests for common aberrations. • Once you have used good quality binoculars it is difficult to be satisfied with less. However, we do become emotionally attached to our possessions and can readily justify poor quality on the grounds of price or some other comparative benefit like ultraportability. • Optics that are entirely free of aberrations exist only in the imagination and, to a large extent, the old adage that you get what you pay for still holds true.