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Telescopes and astronomy equipment
Welcome to this online presentation of telescopes and astronomy equipment. Pleace click om a banner to learn more or to buy. The telescopes shown on this page are only selected examples. If you click at any of the product links, you get to a store with many more telescopes to choose from.
HOBBY ITEMS OF ALL KINDS
: By clicing at this banner you will elicopter and aircraft models, and also a lot of other hobby articles. You will find electronic sets, electronic components for hobby and professional use, remote control helicopters, RC cars, RC boats, RC jet fighters, RC airplanes, airsoft guns of all models, chemistry sets and much more.
Just one example of the many products available:
CREATE YOUR OWN CLOTHES
- with Spreadshirt DesignerHere you can decide patterns, colors, figures and texts for your own clothes by an online interface, and order the clothes you have designed. The shop will send the clothes in 24-48 hours. You can design T-shirts, men's and ladies's longsleeves, jackets, special ladie's wear, trigema, football shirts, shorts, socks, junior's clothes, headwear, underwear and several types of apparel accessories. Design clothes for yourself or as a gift for your friends.
For residents in US, please click at this banner:
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To find microscopes for hobby and professional use, please click here.
SOME EXPLANATIONS
Achromatic: Lenses refract different colours differently, making a certain separation of the colors of an image and a somewhat blurred image. In an achromatic optical device two or more lenses are combined so that the aberration caused by one lense is cancelled by the other.
Aperture: This is the diameter of the objective lens. The graeter the aperture, the more light is gathered, and the weaker objects can be seen. However, a greater aperture does not give any greater maqnification.
Asimuth mount: By this mounting method, the telskope can be rotated both in the horisontal plane and the vertical plane.
Chromatic aberration: This is halos of colours or colored fringes around objects seen in a telescope. This is caused by the lenses refracting light of different colors slightly differerently. It is mostly cancelled by achromatic lens combinations.
Convexe: Somethings that is thickest at the mid part and get thinner towards the periferiy. A convexe lense gathers the light at a point. A convexe lense is magnifying an image. A convexe mirror on the other hand is decreasing the size of the picture. This is because a convexe mirror spreads light.
Concave: Something that is thickest or highest at the perifery and gets thinner or slopes inwards towards the mid. A concave lense spreads the light. A concave mirror projects the light at a point. A concave lense is minimizing a picture, while a concave mirror is making the image greater.
Equatorial mount: By this method of mounting a telescope, one axis is parallel to the Earth''s axis, - the polar axis. The other one is held at right angles to the polar axis, and is therefore parallel to the plane of the Earth's equator, the declination axix. By this mounting system, a celestial object can be held in focus only by rotating the telescope around the polar axis.
Finder: This is a small telescope with a wide angle of view mounted to the main telescope. It is used to help finding the object to look at and pointing the main telescope in the right direction.
Objective: The first unit in a telescope that the image passes through.
Ocular: The unit in a telescope nearest to the eye of the observer.
Refractor telescope: A telescope that uses convexe lenses that the light goes through to magnify the image
Reflector telescopes: A reflector telescopes uses concave mirrors that reflect the image to enlarge it. Usually the objective is a mirror, and there is a mirror to reflect the image into the ocular. The ocular is usually made up of lenses.