We have avoided repetitions of any sort in the matter on radio astronomy. However, if you do come across any repetitions, do bear with us.

radio astronomy For Your Reading Pleasure
How Telescopes Work

A telescope is a device that allows us to bring distant objects closer to us so that we can study them Camera Bag. A good example is the many planets, galaxies, and stars in outer space. Some range from $1 at the toy store to the $1 Kodak Camera.2 billion Hubble Telescope Cannon Camera. There are two types of telescopes. Refractors use a glass lens. Reflectors use mirrors instead of a lens.
Let's take Camera Bags the different pieces of a microscope and see how they work. The objective lens in a Refractor or primary mirror in Reflectors gather incoming light and brings it to a focus. The eyepiece takes that same light Newtonian Telescope and magnifies it to take up a large part of the retina of the eye. Thus, it takes a small image and spreads it out to make it look bigger.
There are two general principles Wireless Binocular Camera to any telescope. One is how well it can collect light. The other is the magnification of the image you are viewing. Collecting light is related directly to the diameter of the lens. The more light collected, the brighter the image.
Magnification is the ability to take an object as a far distance and enlarge it so you can see it clearly. Any magnification can be obtained by using different Ip Camera eyepieces depending on the object you are trying to view.
Here is a simplified explanation. Obtain two magnifying glasses and a piece of paper. Hold one of the glasses between you and the paper. At this point, the image will be blurry and unreadable. Take the second glass and place between your eyes and the first glass. Moving the second glass up or down should bring the piece of paper Telescope Lens into view. It will be larger and upside down though. Give it a try and see what happens.

radio astronomy Products we recommend
Celestron FirstScope 90EQ Telescope

Celestron FirstScope 90EQ Telescope
Celestron's Firstscope 90EQ refractor telescope is a good choice for anyone who wants to try out astronomy at an affordable price, and it can double as a high-power spotting scope. Standing five feet high and weighing nearly 30 pounds, the Firstscope 90EQ is a serious sized achromatic refractor. Achromatic refractors occupy a middle ground between 60mm beginner scopes and premium-priced Apochromatic refractors.

A quarter moon seen through the Celestron Firstscope 90EQ and photographed with a Celestron NexImage. (See larger image.)

Refractors are known for their sharp, high-contrast views of the moon and planets, and the Firstscope 90 includes everything you need to get sharp views of the moon right out of the box. The low-power 20mm eyepiece (50x) shows a nice overall view of the moon, while the 10mm eyepiece (100x) can be used to zoom in for more detail. When the quarter moon is in the sky, I like to look for detail along the "terminator," the dramatic boundary between bright sunlight and dark shadow.

Brighter deep-space objects also show up nicely in the Firstscope 90. On a moonless night, I like the way the 20mm eyepiece frames the ghostly glow of the Orion nebula. Zooming in with the 10mm eyepiece, I can easily pick out all four stars of the Orion nebula's embedded multiple star, the Trapezium. The moons of Jupiter and the rings of Saturn are easy to see with the 10mm eyepiece (100x). With careful focusing, I was even able to detect the Cassini division in Saturn's rings using my own Ultima 7.5mm eyepiece. Low-cost refractors like the Firstscope 90 can be troubled by false color and spherical aberration, but I find these effects are well controlled at moderate powers. When I look at Jupiter and Saturn at magnifications over 100x however, the images are not as sharp as the ones I see with my C102HD refractor.

The telescope can also double as a spotting scope. (Image taken with the Meade Autostar Suite.) (See larger image.)

The equatorial mount included with the Firstscope 90EQ is designed to track stars and planets. When I set up the telescope, I simply point the polar axis at Polaris, the North Star. This allows me to keep celestial objects in view by turning one slow-motion knob, and an optional motor drive is available for hands-free tracking. Celestron also offers the Firstscope 90AZ, which is the same telescope with an alt-azimuth mount. The standard equipment Kellner eyepieces are just average quality; I'd add a 32mm plossl like the one in Celestron's optional accessory kit to bring out the full view of deep space highlights like the Pleiades. You'll also want some star charts to help find planets and star clusters; I like the monthly star charts and viewing tips in Night Sky magazine. --Jeff Phillips

Pros:

• High-contrast views of the moon and planets
• Durable, low-maintenance design
• Can double as a spotting scope

Cons:

• Eyepiece quality just average
• Equatorial mount can be awkward to use
• Planet views over 100x are a little soft
• 90mm is a bit small for deep space viewing

RM-Q-50-99-E-ST Telescopes by Renoma

RM-Q-50-99-E-ST Telescopes by Renoma
Shipped by Standard Groundxinclude('rmdescrip.html', "xhead");

Celestron Regal LX 8x42 Waterproof Binoculars

Celestron Regal LX 8x42 Waterproof Binoculars
The best just got better! The Regal LX Series is Celestron's top-of-theline premium binocular series. Revered by serious birders and outdoor enthusiasts, the Regal Series has traditionally maintained a longstanding reputation for providing superior performance at an affordable price when compared to much more expensive binocular brands. The new Regal LX models now raise the bar even higher. Regals have always been admired for their exquisite precision-crafted optics. The new Regal LX feature BAK-4 prisms and are fully multicoated and phase coated. This next-generation Regal Series also features design refinements that enhance their performance and enjoyment even more. These include a super high reflectivity coating on the prism surface, continuous spectrum high transmission lens coating, and an aspheric eyepiece lens. The Regal LX optics are protected by a easy grip rubber covered body with subtle contours for handling and holding comfort. The center focus knob, right eyepiece diopter adjustment, and adjustable eyecups ensure precision focusing for use with or without eyeglasses.

Celestron Deluxe Tele-extender for Nexstar Telescopes

Celestron Deluxe Tele-extender for Nexstar Telescopes
The Deluxe Tele-Extender for Schmidt-Cassegrain telescopes is a hollow tube that allows you to attach a camera to your telescope, with an eyepiece installed. By using the Deluxe Tele-Extender in combination with an eyepiece, you can increase your instrument's effective focal length to well over 10,000mm! And this corresponds with a matching increase in image size. This technique is known as eyepiece projection photography. The following formula can be used to determine approximate effective focal length:EFL = Telescope focal length/Eyepiece focal length x DF (the distance from the center of the eyepiece to the film).The Deluxe Tele-Extender is used for high-power lunar, solar and planetary photography as well as for extreme terrestrial photography. It fits over the telescope's eyepiece (even large eyepieces such as those in Celestron's Ultima line), and connects to the visual back of the telescope. Optional counterweights will be necessary to properly balance the telescope when using the Tele-Extender.To use the Deluxe Tele-Extender, remove the diagonal from your telescope and insert an eyepiece directly into the visual back. Place the Tele-Extender over both the eyepiece and the visual back, then attach your 35mm SLR camera to the back of the Tele-Extender, using a T-Ring. The Tele-Extender's built-in safety device will help prevent your eyepiece from becoming accidentally dislodged.There are a few things to keep in mind when using this access

Nikon Coolpix Deluxe Digital Camera Accessory Kit for 775, 885, 995, 2000, 4300, 4500 Digital Cameras

Nikon Coolpix Deluxe Digital Camera Accessory Kit for 775, 885, 995, 2000, 4300, 4500 Digital Cameras
Coolpix Digital Deluxe Kit includes universal carrying case, AC adapter, CompactFlash card reader, storage wallet and lens cleaning cloth. Universal carrying case conveniently stores Coolpix camera and accessories. AC adapter powers up selected Coolpix cameras (those that use the EN-EL1 Lithium-ion battery) from an AC power source. CompactFlash card reader plugs into USB port of your computer for easy transfer images. Organize and protect your CompactFlash cards with the included storage wallet.

Nikon 20-45x Zoom Eyepiece for 60mm Fieldscope (25-56x for 82mm Fieldscope)

Nikon 20-45x Zoom Eyepiece for 60mm Fieldscope (25-56x for 82mm Fieldscope)
All lenses are multilayer coated for maximum brightness of view field. Turn-slide rubber eyecup is applied to the wide type eyepiece for comfortable viewing. It helps you position your eyes at the correct eyepoint. Optics employ Eco-glass containing no arsenic or lead.

MELNOR CAR SHOVEL Steel handle telescopes from

MELNOR CAR SHOVEL Steel handle telescopes from
"MELNOR" CAR SHOVEL Steel handle telescopes from 28" to 36" Grey scoop blade 5 yr guarantee Carton Discovery NBR, SUP

radio astronomy in the news
14 Best Ways to Use Your Computer's Spare Time

Wed, 19 Mar 2008 19:19:25 GMT
Wednesday, March 19, 2008 The following article appeared on the Discover Magazine website on February 6, 2008 and is reposted here for your convenience.