By Stephen F Tonkin
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Extra resources for Binocular astronomy
These may include: • Mounting Plate. Because big binoculars necessarily have to be mounted, it is common for them to incorporate a plate, with quarter-inch threaded holes, for direct mounting to a photographic tripod or other mounting. 5). • Angled Eyepieces. There is little to recommend in straight-through binoculars for astronomical observing. They are considerably less comfortable than those with angled eyepieces when you are observing at high elevations. Angled eyepieces also permit the use of photographic or video tripods and heads because they eliminate the need to “limbo-dance” under the tripod when you observe objects of high elevation.
5. 45)° = 5°. There is a conversion chart given in Appendix H. • Feet at 1,000 Yards. S. market. The approximate conversion of this to degrees is to divide by 52. Thus 364 ft at 1,000 yd ≈ (364/52)° = 7°. There is a conversion chart given in Appendix H. Most, but not all, people prefer a wide ﬁeld of view for astronomy. The true ﬁeld of view is dependent on the magniﬁcation and the apparent ﬁeld of view of the eyepiece: True ﬁeld = Apparent ﬁeld ÷ Magniﬁcation Strictly speaking, an eyepiece can have an extremely large ﬁeld of view, but this deteriorates rapidly toward the edge, so it is limited by a ﬁeld stop.
This feature incorporates an electronic system that compensates for motion and vibration. Different manufacturers employ different stabilization systems, which were developed initially for military surveillance and not for astronomy. 4 In addition to the stabilization system, the optics are essentially a roof prism system with a ﬁeld ﬂattener (see Chapter 2) incorporated into the design. The stabilization system (see Chapter 2) compensates for shake and the result is that you can see fainter objects and more detail.