Telescope Barlow Lens

Lenses and mirrors are the elements used to collect and view focused light in telescopes. Mirrors are the medium for focusing in reflector telescopes, while lenses are the medium in refractors. Each type has its own distinct advantages and disadvantages. Refractor type telescopes use lenses. These lenses bend the light when it enters the telescope from the distant object being viewed through it. Because of this refraction it is possible to closely view a distant object. The telescope has two lenses, with one slightly larger.

The eyepiece in the telescope is generally a small lens. Some telescope however, may not use lenses for the eyepiece at all. The eyepiece, in any case, is the most important element of a telescope. It is the element which lets you see correctly whatever it is that you want to focus on. These eyepieces are adjustable and are of a low power. Adjusting the eyepiece allows you to change the magnification factor. What kind of lens you use for the eyepiece is a personal choice. In today's age, several different kinds of eyepieces are available in the market. Because of this motley available, choosing the correct eyepiece fro your requirement may be a difficult task. As a result, you should concentrate on defining the criteria you think are important for your choice. The depth of field, optical quality, sharpness, clarity, brightness, market price, barrel size and how it affects your eyesight are some of the major points of concern. However these criteria always remain individual prerogatives.

Lens designs used in older telescopes go by the name of Huygens and Ramsden. Professional astronomers are advised to not use these lenses anymore as they are not of superior quality, even though they are comparatively less expensive than other market lenses. These lenses also do not provide correction for chromatic aberration or the light circles that form around brighter objects when they are viewed.

Professional astronomers use orthoscopic lenses that are designed specifically for professional stargazing. Even amateurs will find these lenses good for their telescopes. The orthoscopic telescopes use four lenses in the eyepiece, and have a 45 degree field of vision (FOV). Since the eyepiece is the element most important to the quality of a telescope, this design is a winner. The lenses do not strain the user's eyes, and can be used even for viewing closer objects like planets.

For a person with a moderate budget, a Barlow lens is a viable option. The design provides average quality but is a good bargain. It does not burn a hole in one's pocket, and yet is not of inferior quality because of its cost. The range at which this lens is available starts at a low $30 and goes up to $70. The magnification factor is generally not enough for professional use, however for amateurs it should be enough. For hobbyists, it is an ideal lens.

When you're looking for lenses for a telescope, it is important that you determine criteria that most comprehensively fulfill your needs from the lens. Adjustable lenses is a good option as it means you can view objects which are not too far, as well as distant stars with it, and thus obtain the best deal your money can buy you.

Download free hubble image space telescope as well as learning more about refractor vs reflector telescopes when you visit http://www.howdotelescopeswork.com, the online portal for free resource on telescopes making and usage

How do I work this telescope I got for my son?

It has 3 lenses, HM 25mm, H12.5mm and SR4mm, a 1.5x erecting eyepiece, a 2x Barlow lens and that bend around a corner thing. I was able to get the moon with one single lens (don't remember which) but I can't get anything else, no matter what combination, to focus on anything. Please tell me how to look at things.

The first step is to learn where some of the interesting targets are.

These guys have free easy to use software that will show you what you can see, and where to look.

http://stellarium.org/

Then you would want to start by aligning your finder scope/red dot aiming device. Just put the 25mm lens into the diagonal (the around the corner thing); aim the scope to center a fixed and distinct point at a distance; then use the screws on the finder to put the "X" or dot on that point.

Now pick a bright object and point the whole scope in that direction. Start with the highest focal length eyepiece (25mm). Use the diagonal, but forget about the barlow lens (they are probably worthless anyway). Once you have the object in sight, turn the focus knob until you have nice clear image. Now center it in the field and replace the 25mm with a 12.5mm, and focus again. Avoid using too much power; the scope can only resolve around 50x per inch aperture; despite what ever goofy power level is printed on the box. Beyond that you can make things larger, but it will just be a fuzzy blur.

Note: 1) stars will never look larger then a point of light; 2) those nice astro photos in magazines, newspapers, and on the box your scope came in, are impossible to see. It takes time lapse photography, very expensive equipment, a lot of work, and a very advanced astronomer/photographer to capture those kinds of images. 3) Everything in space appears to move - because the ground you are standing on is moving at over 1,000 mph as the Earth rotates. 4) Be patient and enjoy the view; even the smallest telescope can provide many interesting views.




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