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Here are some more information for Achromatic Objectives:

The World Of Refractor Telescopes

Refractor telescopes are some of the oldest telescopes available, utilized at around the beginning of the 15th century and still around today the refractor telescope is quite possibly one of the oldest telescopes in use today. Made up of concave lenses that allow the light to be refracted and images to appear bright and larger than looking at it with the normal eye the refractor telescope can greatly aid in seeing stars, planets and moons.

These telescopes are made up of convex lenses and an eyepiece lens similar to binoculars, these refractors gather light and bend it in order to view objects at a distance, which is particularly useful when looking at stars and the night sky Refractor telescopes may seem complicated and are made up of lenses that are concave and refract the light.

The telescope come in a variety of versions; the Galilean telescope which is named after its creator was one of the first versions and was improved upon by Johannes Kepler with the Keplerian Telescope, which is a refractor telescope that utilized a convex eyepiece as opposed to a concave of the Galilean model. The decades and centuries since have observed newer inventions and different lenses, with the achromatic refractors invented in the mid 16th century and later with apochromatic refractors.

Pros and Cons of Refractor Telescopes

I stated previously that refractor telescopes have been around a long time and with that comes a definite plus since there is a definitive ability to know what the pros and cons of the telescope. These telescopes have obviously come a long was since the 15th century yet the technology has increased to a point in which the refractors have improved yet the size of refractor telescopes pose a problem in the fact that the larger the refractor lens the more chance that it can have defects or begin to sag.

While technology continues to grow and there is no telling where refractor lenses in telescopes will go to in the future one thing for sure is that refractor telescopes have been around for centuries and thus show no decline in their use by many of astronomers. So no matter what telescope you choose to utilize to view the universe or neighborhood, you can not dismiss the value of the refractor telescope and the impact that its utilization has had on astronomy and the search of the skies.

About the Author

Ann Marier has written many articles on
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Parents who have purchased a telescope for their kids? Anything I should know?

Telescopes! Multi-coated 80mm (3/1") achromatic objective lens?!?1? I have never used a Telescope in my life. Like anything some are obviously going to be better than others. Anyone have any idea what I should be looking for as far as Telescopes go? My son is fascinated with the stars and planets. Every day for the past few weeks he just looks out the window in the evening and looks at the stars. I don't want to go down and pick up something that is not going to work. If I have to spend a little money on it then it's a good investment. I want to get it for a last minute family Christmas gift. I can't resist. My son melts my heart when he gets excited about the simplest things. So has anyone had any experience with this? I really have no idea where to post this, but figured at least one parent on here has had to purchase a telescope for their kids at some point. Is there something specific I should know before I go and buy one?

Find the meade telescope number online and order a catologue or order online. They have fairly decent prices for a first telescope ranging from about $100 up to $5000 and higher. My first telescope was meade and it was fantastic! Whatever you do, don't buy cheapos from department stores, not only are they crap but they don't work well.

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