標(biāo)題: Titlebook: Choosing and Using a Dobsonian Telescope; Neil English Book 2011 Springer Science+Business Media, LLC 2011 Deep sky astronomical equipment [打印本頁] 作者: subcutaneous 時(shí)間: 2025-3-21 18:46
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作者: 免除責(zé)任 時(shí)間: 2025-3-21 22:46 作者: 喚醒 時(shí)間: 2025-3-22 01:56 作者: Lamina 時(shí)間: 2025-3-22 07:41
The 12- to 16-inch Dobssolution and light-gathering power. The gain in brightness is always more profound than the gain in resolution. If you step away from an 8-inch Dob and place your eye at the focus of a 16-inch instrument, the first thing you’ll notice is how much more bright (4-fold) the objects have become. Only af作者: 貪心 時(shí)間: 2025-3-22 12:23 作者: Dysarthria 時(shí)間: 2025-3-22 12:57 作者: Dysarthria 時(shí)間: 2025-3-22 18:03
Accessorizing Your Dob many of these telescope have such fast focal ratios (from f/3.3 to f/4), Seidel aberrations such as coma, distortion, and field curvature can be problematic, but a good optician ought to be able to reduce spherical aberration and astigmatism to very acceptable levels, even for a fast mirror. In thi作者: Incorruptible 時(shí)間: 2025-3-22 22:05 作者: 輕推 時(shí)間: 2025-3-23 03:36
Sketching and Imaging with Your Dob open clusters, and faint galaxies that skirt the great dark of interstellar space. The spectacular light-gathering power of even an 8-inch or 10-inch ‘scope has inspired many amateurs to try their hand at astronomical sketching and astrophotography. This chapter explores some of the extraordinary a作者: flaggy 時(shí)間: 2025-3-23 08:47 作者: 存在主義 時(shí)間: 2025-3-23 10:48 作者: myelography 時(shí)間: 2025-3-23 14:37
https://doi.org/10.1007/978-3-658-14200-1ing to a 12-inch aperture from a 10-inch instrument. And it goes without saying that the move from 12 to 16 inches is sure to be immediately obvious to the eye. This chapter takes a look at the largest instruments commonly used by amateurs – those in the 12- to 16-inch aperture class. They offer hug作者: overshadow 時(shí)間: 2025-3-23 21:51
1431-9756 unts for the various models (plus accessories) on the market and descriptions of the many innovations that amateurs have made to optimize their telescopes‘ performance. .978-1-4419-8785-3978-1-4419-8786-0Series ISSN 1431-9756 Series E-ISSN 2197-6562 作者: abduction 時(shí)間: 2025-3-24 01:25
https://doi.org/10.1007/978-3-8348-9169-3a discussion concerning the ins and outs of the reflecting telescope, so that you can get the most out of it and maintain it in tiptop condition. This chapter will discuss everything you need to know about how your Newtonian works. On our road to understanding, we’ll be dipping in and out of history作者: ostrish 時(shí)間: 2025-3-24 05:19 作者: Ambiguous 時(shí)間: 2025-3-24 06:45
https://doi.org/10.1007/978-3-658-02011-8ovement” didn’t become a “revolution” until it could reach out from its traditional hinterland of deep sky nirvana and begin to make inroads into niches traditionally dominated by other kinds of ‘scopes. We’re thinking, of course, of planetary observing, where the smaller aperture, high-quality refr作者: AWE 時(shí)間: 2025-3-24 13:56
https://doi.org/10.1007/978-3-658-14200-1solution and light-gathering power. The gain in brightness is always more profound than the gain in resolution. If you step away from an 8-inch Dob and place your eye at the focus of a 16-inch instrument, the first thing you’ll notice is how much more bright (4-fold) the objects have become. Only af作者: Pastry 時(shí)間: 2025-3-24 17:50
,L?sungen zu den Lernkontrollen,f complicated, and temperamental, electronic mounts. The majority of Dobs thus far discussed are mounted in a rocker box-style mount called a Lazy Susan or affixed to a single axis arm (such as smaller Orion Starblast ‘scopes discussed previously). In this chapter, we’ll take a look at Newtonian ref作者: 表狀態(tài) 時(shí)間: 2025-3-24 20:14
,Der Bereitschaftsarzt im Stra?enverkehr, of the deep sky and the endless treasures it presents to the curious mind. Once an amateur astronomer gets a look at Omega Centauri or the Orion Nebula (M42) through a 16-inch Dobsonian, chances are he or she will be pining for more aperture. You see, there’s really no substitute for it. More light作者: CARE 時(shí)間: 2025-3-25 03:02 作者: 舊式步槍 時(shí)間: 2025-3-25 06:51
https://doi.org/10.1007/978-3-322-88217-2 eyepiece? Do you want to evaluate the optical quality of your ‘scope? This chapter addresses all these issues and helps you get the maximum performance for your hard-earned investment. Let’s begin with the age-old Newtonian chestnut – collimation – and how best to execute a near perfect alignment o作者: CANDY 時(shí)間: 2025-3-25 10:03
Vom liberalen zum sozialen Privatrecht?, open clusters, and faint galaxies that skirt the great dark of interstellar space. The spectacular light-gathering power of even an 8-inch or 10-inch ‘scope has inspired many amateurs to try their hand at astronomical sketching and astrophotography. This chapter explores some of the extraordinary a作者: BRAVE 時(shí)間: 2025-3-25 14:46
Sarah J?ger,Arnulf von Schelihaover 30 years on the streets of San Francisco right up to the proliferation of designs commercial Dobs now embody. It is extraordinary that an eccentric man with a passion for putting together a large telescope from leftover junk would one day go on to inspire generations of amateur astronomers and 作者: 制定法律 時(shí)間: 2025-3-25 17:27 作者: Flounder 時(shí)間: 2025-3-25 23:11 作者: FLASK 時(shí)間: 2025-3-26 01:45 作者: CAMEO 時(shí)間: 2025-3-26 05:35
https://doi.org/10.1007/978-3-8348-9169-3What’s the ideal starter ‘scope? Well, it should have decent optics, be -portable enough to set up in just a few minutes, and have enough light grasp to bag many of the brighter treasures of the night sky.作者: 毛細(xì)血管 時(shí)間: 2025-3-26 11:28 作者: ambivalence 時(shí)間: 2025-3-26 14:43
The Mini-DobsWhat’s the ideal starter ‘scope? Well, it should have decent optics, be -portable enough to set up in just a few minutes, and have enough light grasp to bag many of the brighter treasures of the night sky.作者: 稱贊 時(shí)間: 2025-3-26 19:41 作者: indemnify 時(shí)間: 2025-3-26 21:24 作者: opalescence 時(shí)間: 2025-3-27 02:40
Neil EnglishA recent upsurge in sales of commercially-made Dobsonians make this book very timely.Includes speculation on how Dobsonians will change and improve in the future.Contains many practical and useful hin作者: Regurgitation 時(shí)間: 2025-3-27 09:06
The Patrick Moore Practical Astronomy Serieshttp://image.papertrans.cn/c/image/226184.jpg作者: Genistein 時(shí)間: 2025-3-27 12:56
Choosing and Using a Dobsonian Telescope978-1-4419-8786-0Series ISSN 1431-9756 Series E-ISSN 2197-6562 作者: fixed-joint 時(shí)間: 2025-3-27 15:32 作者: 衰老 時(shí)間: 2025-3-27 21:08 作者: Pantry 時(shí)間: 2025-3-27 23:44 作者: judicial 時(shí)間: 2025-3-28 05:03
1431-9756 improve in the future.Contains many practical and useful hinIn the 1960‘s, American amateur astronomer, John Dobson, designed a revolutionary kind of astronomical telescope featuring a lightweight large-aperture reflecting system on a simple mounting, using the then-revolutionary material called tef作者: vitreous-humor 時(shí)間: 2025-3-28 08:11
https://doi.org/10.1007/978-3-8348-9169-3 chapter will discuss everything you need to know about how your Newtonian works. On our road to understanding, we’ll be dipping in and out of history to record the key events that shaped the evolution of the Newtonian into its quintessentially modern form.作者: 控制 時(shí)間: 2025-3-28 12:49
,L?sungen zu den Lernkontrollen, to set up and cool down fast enough to make observations worthwhile on most clear nights. Many diehard observers reckon an 8-inch or 10-inch (20- or 35-cm) Dobsonian comes pretty darn close to that ideal for reasons that we will supply in this chapter.作者: 有害 時(shí)間: 2025-3-28 14:55 作者: 老巫婆 時(shí)間: 2025-3-28 21:29
Vom liberalen zum sozialen Privatrecht?, ‘scope has inspired many amateurs to try their hand at astronomical sketching and astrophotography. This chapter explores some of the extraordinary achievements of amateurs using modest equipment and more than a little enthusiasm.作者: prediabetes 時(shí)間: 2025-3-28 23:01 作者: Corporeal 時(shí)間: 2025-3-29 05:09
Getting Serious to set up and cool down fast enough to make observations worthwhile on most clear nights. Many diehard observers reckon an 8-inch or 10-inch (20- or 35-cm) Dobsonian comes pretty darn close to that ideal for reasons that we will supply in this chapter.作者: Legion 時(shí)間: 2025-3-29 09:08 作者: 眨眼 時(shí)間: 2025-3-29 13:29 作者: Biguanides 時(shí)間: 2025-3-29 15:58
,Der Bereitschaftsarzt im Stra?enverkehr, means more photons bathing the human retina and with it, the promise of seeing ever greater detail. Unfortunately, few make the transition to larger apertures, but when they do, few ever look back. This chapter is devoted to the monsters of the Dobsonian world and the observers lucky enough to own and use them.
