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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.
Price: 39.99 £ | Shipping*: 0.00 £ -
Outdoor Telescope High Clear Astronomical Refracting Telescope Professional Stargazing Telescope
This telescope can help child to observe the world farther away and cultivate their scientific interest. It has a long service time and convenient storage. Features: Select fine quality aluminum alloy material, firm, long service time, nice bearing capacity. Triangle support design, stable and not shaking, convenient for observation. Removable design, convenient storage and installation, save storage space. High magnification, can observe stars, moon, etc., help child explore the world, cultivate scientific interest. Can be used as a nice choice for gifts, practical and playable, to cultivate child's observation ability. Specifications: Material: Aluminium alloy Focal Length: 300mm Focal Ratio: 4.29 Eyepiece: 20mm, 6mm Magnification Lens: 3X / 1.5X Star Finderscope: 5 x 24 Field of view: 1.2 degrees Item weight: 1650g / 3.6lb Package size: 440 * 220 * 110mm / 17.3 * 8.7 * 4.3in Package weight: 1800g / 4.0lb Packing List: 1 * Astronomical Telescope 1 * Tripod 2 * Eyepiece 2 * Magnification Lens 1 * Star Finderscope 1 * Star Finderscope Holder 1 * Lens Cap 1 * ZenithTelescope 1 * Moon Filter Label：Yes
Price: 74.05 £ | Shipping*: 0.0 £ -
ALLFOCUS Telescope Professional Astronomical adults Kids,40070,20-333X Refracting Telescope Portable
ALLFOCUS Telescope Professional Astronomical adults Kids,40070,20-333X Refracting Telescope Portable
Price: 53.79 £ | Shipping*: 0 £ -
ALLFOCUS Telescope Professional Astronomical adults Kids,40070,20-333X Refracting Telescope Portable
ALLFOCUS Telescope Professional Astronomical adults Kids,40070,20-333X Refracting Telescope Portable
Price: 53.79 € | 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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Is something like an aviator sunglasses still in fashion?
Yes, aviator sunglasses are considered a classic style that has remained popular over the years. They are a versatile accessory that can complement a variety of outfits and face shapes. Many fashion icons and celebrities continue to wear aviator sunglasses, keeping them in style. Overall, aviator sunglasses are a timeless and fashionable choice for both men and women.
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Astronomical Telescope Refractor Type Space Telescope Tripod Small Refracting Spotting Scopes
Description: F50360M is a small refracting telescope, with larger diameter (50mm) and low price advantage, does not occupy a place, suitable for novice astronomers use, configuration of 2 different magnification eyepiece and 1.5X doubled as a mirror. You can make free collocation, observe the different distance and the size of the object. Type:F36050 Astronomical telescope 100% brand new and high quality. Color :As picture Manufacturer:China Refractive / focal length: 360mm, pass aperture: 50mm Can be set 60 times, 18 times, plus 1.5x positive lens can be set up to 90 times, 27 times Theoretical resolution: 2 seconds, which is equivalent to see the distance of 1000 meters away from the 0.970 cm of the two objects. Usage rules: 1, pull the legs open, the telescope tube mounted on the yoke, with a large lock screw adjustment. 2, the telescope is inserted into the focus of the telescope, with a corresponding screw fixed. 3, the eyepiece mounted on the zenith mirror, with the corresponding screws fixed. 4, if you want to use a positive lens to enlarge, put it between the eyepiece and the lens tube (no need to install 90 degrees zenith mirror), so you can watch the celestial body. Include: 1x telescope 2x eyepiece H20mm, H6mm 1x 1.5x positive mirror 1x90 degree zenith telescope 1x38 cm height aluminum alloy three feet Label: Yes
Price: 37.0 £ | Shipping*: 0.0 £ -
Astronomical Telescope Refractor Type Space Telescope Tripod Small Refracting Spotting Scopes
Description: F50360M is a small refracting telescope, with larger diameter (50mm) and low price advantage, does not occupy a place, suitable for novice astronomers use, configuration of 2 different magnification eyepiece and 1.5X doubled as a mirror. You can make free collocation, observe the different distance and the size of the object. Type:F36050 Astronomical telescope 100% brand new and high quality. Color :As picture Manufacturer:China Refractive / focal length: 360mm, pass aperture: 50mm Can be set 60 times, 18 times, plus 1.5x positive lens can be set up to 90 times, 27 times Theoretical resolution: 2 seconds, which is equivalent to see the distance of 1000 meters away from the 0.970 cm of the two objects. Usage rules: 1, pull the legs open, the telescope tube mounted on the yoke, with a large lock screw adjustment. 2, the telescope is inserted into the focus of the telescope, with a corresponding screw fixed. 3, the eyepiece mounted on the zenith mirror, with the corresponding screws fixed. 4, if you want to use a positive lens to enlarge, put it between the eyepiece and the lens tube (no need to install 90 degrees zenith mirror), so you can watch the celestial body. Include: 1x telescope 2x eyepiece H20mm, H6mm 1x 1.5x positive mirror 1x90 degree zenith telescope 1x38 cm height aluminum alloy three feet Label: Yes
Price: 49.99 € | Shipping*: 0.0 € -
NEW Men Polarized Square Aviator Sunglasses Fashion Male Mirror Eyewear Aluminum 5009 C5 blue
Lenses: Polarized Size: 57-15-133 mm Material: Stainless Steel Brand: Unique Label Introducing our latest men's polarized sunglasses. They are crafted with high-quality materials, featuring polarized lenses for UV protection and glare reduction. The sleek design complements any face shape, making them perfect for any occasion. Elevate your look and protect your eyes with these must-have sunglasses.
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NEW Men Polarized Square Aviator Sunglasses Fashion Male Mirror Eyewear Aluminum 5009 C5 blue
Lenses: Polarized Size: 57-15-133 mm Material: Stainless Steel Brand: Unique Label Introducing our latest men's polarized sunglasses. They are crafted with high-quality materials, featuring polarized lenses for UV protection and glare reduction. The sleek design complements any face shape, making them perfect for any occasion. Elevate your look and protect your eyes with these must-have sunglasses.
Price: 13.28 € | Shipping*: 0.0 €
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What is the difference between polarized and non-polarized?
Polarized light refers to light waves that vibrate in a single plane, while non-polarized light consists of light waves vibrating in multiple planes. Polarized light is filtered to allow only waves vibrating in a specific orientation to pass through, reducing glare and improving visibility. Non-polarized light is a mix of waves vibrating in all directions, resulting in scattered light that can cause glare.
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Which bond is strongly polarized and which is weakly polarized?
A strongly polarized bond is one in which the electronegativity difference between the two atoms is large, leading to a significant unequal sharing of electrons. For example, the bond between a highly electronegative atom like fluorine and a less electronegative atom like hydrogen is strongly polarized. On the other hand, a weakly polarized bond is one in which the electronegativity difference between the two atoms is small, resulting in a more equal sharing of electrons. An example of a weakly polarized bond is the bond between two carbon atoms in a hydrocarbon molecule.
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Is the difference between polarized and non-polarized sunglasses significant?
Yes, the difference between polarized and non-polarized sunglasses is significant. Polarized sunglasses are designed to reduce glare and block out horizontal light waves, making them ideal for activities such as driving, fishing, and skiing. Non-polarized sunglasses, on the other hand, simply reduce the overall amount of light that reaches the eyes without specifically targeting glare. Therefore, the choice between polarized and non-polarized sunglasses can have a noticeable impact on visual comfort and clarity in various outdoor settings.
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Which bond is strongly polarized and which one is weakly polarized?
Ionic bonds are strongly polarized because they involve the complete transfer of electrons from one atom to another, resulting in a significant difference in electronegativity. On the other hand, covalent bonds are weakly polarized because they involve the sharing of electrons between atoms, leading to a more balanced distribution of charge.
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