By Stephen Tonkin
This ebook includes every thing an astronomer must learn about binocular watching. The ebook takes an in-depth examine the tools themselves. It has sections on comparing and purchasing binoculars and binocular telescopes, their care, mounting, and add-ons. furthermore there's a number of fifty high quality gadgets to be obvious with 50mm and 100mm binoculars. some great benefits of utilizing either eyes for astronomical staring at are many and substantial, mostly as a result of the manner the human mind procedures visible info. This booklet allows the astronomer to maximise these benefits.
Read or Download Binocular Astronomy (Patrick Moore's Practical Astronomy Series) PDF
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Extra resources for Binocular Astronomy (Patrick Moore's Practical Astronomy Series)
As one put it: “These are amazing, Mr. Tonkin. ” The colleague’s son was, as you can imagine, a bit deﬂated because his binoculars seemed so inferior. I pointed out that mine had cost almost exactly a hundred times the cost of his. I showed the students how to detect the off-axis chromatic aberration and pincushion distortion in mine, and then asked them to consider if they thought that the image in mine was a hundred times better. Honor was satisﬁed and we got on with enjoying the match, albeit with my binoculars having far more use than the budget ones.
24 Binocular Astronomy Aberrations Aberrations are errors in an optical system. There are six optical aberrations that may affect the image produced by a telescope. Some affect the quality of the image, others affect its position. They are: • • • • • • Chromatic aberration: error of quality Spherical aberration: error of quality Coma: error of quality Astigmatism: error of quality Field curvature: error of position Distortion: error of position Chromatic aberration is an error of refractive systems and is therefore of consideration for all binoculars.
There is perennial debate on whether, if you use small or medium-sized binoculars for astronomy, you should use Porro prism or roof prism binoculars. 2. Variety of 10×50 porro-prism binoculars. L to R: Older style center-focus Z-body with ﬁxed eyecups (Zenith); Robust center-focus B-body style (Swift Newport); Modern lightweight center-focus Z-body with folding eyecups (Helios Naturesport); Robust individual focus Z-body (Strathspey Marine). conventional wisdom is that Porro prism binoculars are better for astronomy.