Viewing the Constellations with Binoculars: 250+ Wonderful Sky Objects to See and Explore
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Images Additional images. About this book Viewing the Constellations with Binoculars is a complete guide to practical astronomy, written for beginners, intermediate-level astronomers, and even people who have not yet turned their gaze to the night sky. Contents Part I: Background. Customer Reviews Review this book. Media reviews. Current promotions. Viewing the Constellations with Binoculars. More Info. Budget Astrophotography.
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It will appeal to amateurs and professionals alike. Solicito que, ao deparar-se com algum link quebrado, por favor, entre em contato e me informe. If we therefore wish to make the best use of the binoculars or a telescope, it is best if the exit pupil of the instrument is no bigger than between 2 and 5 mm. And it is no coincidence that these values are the same limits at which we see clearly without optical help in everyday life. With the exit pupil of the binoculars we can estimate the true size of the objective.
The most mistakes that occur on lenses also occur on the edges, due to the poor glass grinding. In order for these mistakes not to influence the quality of the picture the manufacturers place a diaphragm between the objective and the eyepiece, with which they limit the light that comes to the eyepiece.
This, of course, means that instead of a mm objective we get a or even mm one.
Viewing the constellations with binoculars : 250+ wonderful sky objects to see and explore
Knowing only the objective diameter, therefore, does not tell us everything; we get the entire picture only in combination with the exit pupil. Choosing Binoculars for Astronomical Observations Because you would like to observe dim celestial bodies, the objective diameter should be as large as possible.
Taking into account the different prices and availability, it is still best to select a mm objective. Smaller ones are not that much cheaper, and the larger ones are much more expensive. The field of view should be at least 68 and not 58 , which means that the manufacturer used the better eyepieces, which are more appropriate for astronomical observations.
Another important reason lies behind this choice of binoculars. Every good amateur telescope has a finderscope, with which we help direct the telescope in the desired direction of the sky. In better. Thus, if you get used to the view of the night sky through such binoculars you will later on find it much easier to switch to observing and searching for certain celestial objects with a telescope. For binoculars of different magnifications, we will call attention to the magnification size. A Few Tips When Purchasing Binoculars — Be sure to check while you are still in the shop whether it is possible to completely sharpen the picture in both optical tubes and whether the picture is sharp over the entire field of view.
If the distance between the eyes has been correctly adjusted, the picture from both tubes will merge into a single round field of view. If you see two covering fields of view, there is a problem, and your observations will be disrupted to a certain degree. Rainbow edges are the sign of poor optics. If it is too small, the binoculars probably have poor objectives, and a diaphragm was used by the manufacturer to reduce the size of the entry pupil.
Toward the edge of the field of view the stars are increasingly distorted.
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Instead of bright spots we see lines or smudges. Such binoculars are fine for daylight field observations but not for astronomical observations. Pinpoint stars are the hardest test of the quality of the objective. Such eyepieces are better, and the binoculars will, in most cases, be more expensive. But if you have to lean the eye on the eyepiece in binoculars in order to see the entire field of view, you will have continual problems with lenses that will constantly smear from contact with eyelashes.
Even though the picture in such binoculars is extremely sharp, it is always slightly colored red, green, or blue , and the stars in the field of view also appeared slightly colored.
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Such instruments have zenith prisms in front of the eyepieces so you can watch the celestial objects high in the sky without breaking your neck. Of course, these are slightly more expensive. Finally, let me answer the question that was asked above — why binoculars? Place it vertically in front of the eye so that it touches the cheekbone and brow.
Close the other eye and look toward a strong source of light. The pencil will have a dark, opaque central part and blurred edges. Now look toward the dark part of the room and wait for a few minutes. Watch the width of the dark, opaque central part. If you cannot see it any more, and at least a little bit of light is coming through the central part of the pencil, your pupil measures 7 mm.
Tripods Is a tripod necessary or not for astronomical observations with binoculars?