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Choosing and Using a Refracting Telescope
Choosing and Using a Refracting Telescope has been written for the many amateur astronomers who already own, or are intending to purchase, a refracting telescope – perhaps to complement their existing arsenal of larger reflecting telescopes – or for the specialist who requires a particular refractor for serious astronomical applications or nature studies. Four hundred year ago, during the winter of 1609, a relatively unknown Italian scientist, Galileo Galilei designed a spyglass with two crude lenses and turned it skyward.Since then, refractors have retained their dominance over all types of reflector in studies of the Moon, planets and double stars because of the precision of their optics and lack of a central obstruction in the optical path, which causes diffraction effects in all commercially-made reflectors. Most mature amateur astronomers got started with a 60mm refractor, or something similar.Thirty years ago, there was little choice available to the hobbyist, but in the last decade long focus crown-flint achromats have moved aside for some exquisitely crafted apochromatic designs offered by leading commercial manufacturers.There has been a huge increase in the popularity of these telescopes in the last few years, led by a significant increase in the number of companies (particularly, William Optics, Orion USA, StellarVue, SkyWatcher and AstroTech) who are now heavily marketing refractors in the amateur astronomical magazines. In Choosing and Using a Refracting Telescope, well-known observer and astronomy writer Neil English celebrates the remarkable history and evolution of the refracting telescope and looks in detail at the instruments, their development and their use.A major feature of this book is the way it compares not only different classes of refractor, but also telescopes of each class that are sold by various commercial manufacturers.The author is perhaps uniquely placed to do this, having used and testedliterally hundreds of different refracting telescopes over three decades. Because it includes many diverse subjects such as imaging with consumer-level digital cameras, imaging with webcams, and imaging with astronomical CCD cameras – that are not covered together in equal depth in any other single volume – Choosing and Using a Refracting Telescope could become the ‘refractor bible’ for amateur astronomers at all levels, especially those who are interested in imaging astronomical objects of every class.
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ALLFOCUS Telescope Professional Astronomical adults Kids,40070,20-333X Refracting Telescope Portable
ALLFOCUS Telescope Professional Astronomical adults Kids,40070,20-333X Refracting Telescope Portable
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ALLFOCUS Telescope Professional Astronomical adults Kids,40070,20-333X Refracting Telescope Portable
ALLFOCUS Telescope Professional Astronomical adults Kids,40070,20-333X Refracting Telescope Portable
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SVBONY SV501P Telescope for Beginners Adults Astronomical Refracting Telescope for Gift Moon
SVBONY SV501P Telescope for Beginners Adults Astronomical Refracting Telescope for Gift Moon
Price: 88.65 € | Shipping*: 0 €
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What is the operating principle of a refracting telescope?
The operating principle of a refracting telescope involves the use of lenses to gather and focus light. The objective lens at the front of the telescope collects light from distant objects and brings it to a focus point. The eyepiece lens then magnifies this focused image for the observer to see. By bending and focusing light with lenses, a refracting telescope can produce clear and detailed images of celestial objects.
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How is a simple refracting telescope constructed, such as Kepler's telescope?
A simple refracting telescope, like Kepler's telescope, is constructed using two main components: a convex lens and a concave lens. The convex lens, also known as the objective lens, is placed at the end of the telescope closest to the object being observed. This lens gathers and focuses light rays to form an image. The concave lens, or eyepiece lens, is positioned at the opposite end of the telescope and magnifies the image formed by the objective lens, allowing the viewer to see a larger and clearer image. The two lenses are set at a specific distance from each other to ensure proper magnification and focus.
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What are the differences between a reflecting telescope and a refracting telescope?
The main difference between a reflecting telescope and a refracting telescope is the way they gather and focus light. A reflecting telescope uses mirrors to gather and focus light, while a refracting telescope uses lenses. Reflecting telescopes are typically more compact and have a wider field of view, while refracting telescopes are longer and have a narrower field of view. Additionally, reflecting telescopes are less affected by chromatic aberration, a type of distortion caused by the way lenses refract different colors of light, compared to refracting telescopes.
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Which series have learning potential?
Series that have learning potential include documentaries, historical dramas, and educational shows. Documentaries provide in-depth information on various topics, historical dramas offer insights into different time periods, and educational shows cover a wide range of subjects from science to art. These series can help viewers expand their knowledge, learn new things, and gain a deeper understanding of the world around them.
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15X-150X 70mm Large Aperture Astronomic Refracting Monocular Telescope with Tripod Eyepiece Dust multicolour
Features： With multi-coated FMC blue film, with high transmission, the picture is marvelously clear and bright. 300mm main scope tube, 70mm object lens, comes with 3 eyepieces (H6mm, H20mm, & F12mm), 1.5X and 3X teleconverter, adjustable magnification from 15X to 150X, perfect for star gazing, bird watching, concert, scenery appreciation, etc. Professional entry-level astronomical telescope, designed for children, student and adults. Comes with a aluminum alloy tripod with adjustable height, light weight but sturdy and stable, convenient for carrying during trip. A nice gift for children, good for cultivating their interest and knowledge of astronomy, helping them away from the electronic screen. Specifications： Color: Multicolor Material: Aluminum Magnification: 15X-150X Tripod Height: 45cm-145cm Product Size: 50 * 45 * 7cm/ 19.6 * 17.7 * 2.7inch Product Weight: 1.5kg/ 3.3oz Package Size: 44 * 22 * 11cm/ 17.3 * 8.6 * 4.3inch Package Weight: 1.73kg/ 3.8lbs Note： Please don't look at the sun directly, or your eyes will be hurt, you can use filters instead. Installation steps: ①Unfold the tripod, and then fix the telescope on the tripod with screws; ②Install the reflector on focusing barrel, and fix it with screws; ③Fix the eyepiece on the reflector with screws; ④If you want to use the 45° erecting lens, install it between eyepiece and scope tube. Package List： 1 * Telescope 1 * Tripod 1 * Finder Scope 1 * Dust Cover 1 * 45° Erecting Lens 3 * Eyepiece (H6mm/H20mm/F12mm) 1 * 3X Teleconverter 1 * 1.5X Teleconverter
Price: 94.47 € | Shipping*: 0.0 € -
15X-150X 70mm Large Aperture Astronomic Refracting Monocular Telescope with Tripod Eyepiece Dust multicolour
Features： With multi-coated FMC blue film, with high transmission, the picture is marvelously clear and bright. 300mm main scope tube, 70mm object lens, comes with 3 eyepieces (H6mm, H20mm, & F12mm), 1.5X and 3X teleconverter, adjustable magnification from 15X to 150X, perfect for star gazing, bird watching, concert, scenery appreciation, etc. Professional entry-level astronomical telescope, designed for children, student and adults. Comes with a aluminum alloy tripod with adjustable height, light weight but sturdy and stable, convenient for carrying during trip. A nice gift for children, good for cultivating their interest and knowledge of astronomy, helping them away from the electronic screen. Specifications： Color: Multicolor Material: Aluminum Magnification: 15X-150X Tripod Height: 45cm-145cm Product Size: 50 * 45 * 7cm/ 19.6 * 17.7 * 2.7inch Product Weight: 1.5kg/ 3.3oz Package Size: 44 * 22 * 11cm/ 17.3 * 8.6 * 4.3inch Package Weight: 1.73kg/ 3.8lbs Note： Please don't look at the sun directly, or your eyes will be hurt, you can use filters instead. Installation steps: ①Unfold the tripod, and then fix the telescope on the tripod with screws; ②Install the reflector on focusing barrel, and fix it with screws; ③Fix the eyepiece on the reflector with screws; ④If you want to use the 45° erecting lens, install it between eyepiece and scope tube. Package List： 1 * Telescope 1 * Tripod 1 * Finder Scope 1 * Dust Cover 1 * 45° Erecting Lens 3 * Eyepiece (H6mm/H20mm/F12mm) 1 * 3X Teleconverter 1 * 1.5X Teleconverter
Price: 72.76 £ | Shipping*: 0.0 £ -
15X-150X 70mm Large Aperture Astronomic Refracting Monocular Telescope with Tripod Eyepiece Dust multicolour
Features： With multi-coated FMC blue film, with high transmission, the picture is marvelously clear and bright. 300mm main scope tube, 70mm object lens, comes with 3 eyepieces (H6mm, H20mm, & F12mm), 1.5X and 3X teleconverter, adjustable magnification from 15X to 150X, perfect for star gazing, bird watching, concert, scenery appreciation, etc. Professional entry-level astronomical telescope, designed for children, student and adults. Comes with a aluminum alloy tripod with adjustable height, light weight but sturdy and stable, convenient for carrying during trip. A nice gift for children, good for cultivating their interest and knowledge of astronomy, helping them away from the electronic screen. Specifications： Color: Multicolor Material: Aluminum Magnification: 15X-150X Tripod Height: 45cm-145cm Product Size: 50 * 45 * 7cm/ 19.6 * 17.7 * 2.7inch Product Weight: 1.5kg/ 3.3oz Package Size: 44 * 22 * 11cm/ 17.3 * 8.6 * 4.3inch Package Weight: 1.73kg/ 3.8lbs Note： Please don't look at the sun directly, or your eyes will be hurt, you can use filters instead. Installation steps: ①Unfold the tripod, and then fix the telescope on the tripod with screws; ②Install the reflector on focusing barrel, and fix it with screws; ③Fix the eyepiece on the reflector with screws; ④If you want to use the 45° erecting lens, install it between eyepiece and scope tube. Package List： 1 * Telescope 1 * Tripod 1 * Finder Scope 1 * Dust Cover 1 * 45° Erecting Lens 3 * Eyepiece (H6mm/H20mm/F12mm) 1 * 3X Teleconverter 1 * 1.5X Teleconverter
Price: 92.52 € | Shipping*: 0.0 € -
504pcs Building Blocks Car Early Learning Development Benefits Intelligence Assembled Toys
504pcs Building Blocks Car Early Learning Development Benefits Intelligence Assembled Toys
Price: 5.30 € | Shipping*: 1.99 €
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What is FIFA youth development?
FIFA youth development refers to the programs and initiatives aimed at identifying, nurturing, and developing young football talent. These programs are designed to provide young players with the necessary skills, training, and support to help them reach their full potential and eventually transition into professional football. FIFA youth development also focuses on promoting the overall well-being and education of young players, as well as providing them with opportunities to compete at the international level. Ultimately, the goal of FIFA youth development is to cultivate the next generation of talented footballers and contribute to the growth and success of the sport.
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Is machine learning already artificial intelligence?
Machine learning is a subset of artificial intelligence. It involves training a machine to learn from data and make predictions or decisions without being explicitly programmed to do so. Artificial intelligence, on the other hand, encompasses a broader range of technologies and applications that enable machines to perform tasks that typically require human intelligence, such as understanding natural language, recognizing patterns, and solving problems. While machine learning is an important component of artificial intelligence, AI also includes other techniques such as natural language processing, computer vision, and robotics.
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Is it worth learning web development?
Yes, learning web development can be worth it for many reasons. It is a valuable skill in today's digital age, with a high demand for web developers in the job market. It can also provide opportunities for freelance work and entrepreneurship. Additionally, web development allows you to create and customize websites and web applications, which can be a rewarding and creative endeavor.
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Does potential have anything to do with intelligence?
Potential and intelligence are related but not the same. Potential refers to the capacity for growth, development, and success, while intelligence is the ability to acquire and apply knowledge and skills. While intelligence can contribute to one's potential, potential also encompasses other factors such as motivation, determination, and opportunities for growth. Therefore, potential and intelligence are connected, but potential is a broader concept that includes intelligence as one component.
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