TwinStar White 4.5" iOptron Computerized GPS Reflector Telescope

!9# TwinStar White 4.5" iOptron Computerized GPS Reflector Telescope

Rate : | Price : | Post Date : Nov 17, 2011 17:00:18
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This telescope is ideal for backyard astronomy enthusiasts or older children with space on the brain. Simply turn the telescope on, choose the object you want to see on the handheld controller and the computerized GPS mount does the rest. With a large 114mm (4.5 inch) primary mirror and a 500mm focal length, this fast F/4.4 telescope is the perfect large light-gathering instrument for wide-field and deep space astronomy. You can observe fabulous nebulae, galaxies, binary star systems and most of the famed deep-space Messier objects. Of course, with this telescope, you can see outstanding detail when viewing the moon and you can see the Rings of Saturn and the Moons of Jupiter. The iOptron SmartStar-G Alt-Azimuth Mount with GPS, a.k.a. The Cube, is probably the most functional and flexible unit on the market. Both axis motors are built into a small single unit. In addition, there are no "dead spots" -- so you can point your telescope anywhere above the horizon, whereas, other mounts block the telescope tube at certain points of rotation. This mount comes standard with AC connection, but also accepts 8 AA cell batteries for use at home or in the field (Batteries sold separately). The GoToNova computerized control system is by far the most technologically advanced automated tracking system available on the market today. With a database of 50,000 celestial objects, including all of the most famous galaxies, nebulae, star clusters, not to mention the planets, you'll be able to enjoy star gazing with the simple push of a button. There is no need to align the telescope, with GPS, it knows its location. The GoToNova Controller is much easier to use than other similar products. The hand controller is more intuitive with menu categories better organized. It also has a larger LCD screen with more lines of content compared with the competition. With the easy-to-use hand controller you can easily set up your telescope and select where you want to go.

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!9# TwinStar Silver 90mm iOptron Computerized GPS Cassegrain Telescope

Brand : TwinStar / iOptron | Rate : | Price :
Post Date : Nov 03, 2011 08:19:37 | Usually ships in 1-2 business days

TwinStar Silver 90mm iOptron Computerized GPS Cassegrain Telescope

• 90mm fully coated, achromatic objective lens
• 1200mm focal length
• Kellner 25mm Eyepiece; (1) Kellner 9mm Eyepiece included
• Altazimuth Mount (Point & Shoot) -- Full Size Tripod
• 45 degree angle prism -- images are seen right-side up

More Specification..!!

TwinStar Silver 90mm iOptron Computerized GPS Cassegrain Telescope

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3 Types of Telescopes - Know the Differences Or Risk Buying the Wrong One

!9# 3 Types of Telescopes - Know the Differences Or Risk Buying the Wrong One

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There are 3 main types of telescopes and each one performs differently and may be used for different purposes. If you are thinking about buying a telescope to look at stars and deep space then you should know that this might not be possible if you live in a built up area with light pollution. If it is just the moon and the planets you want to look at then you should now that refractors are better than reflectors for this. If you are prepared to travel with your telescope then you should know which types are fragile and which ones give you the best performance from a smaller scope.

The three types of telescopes that exist for capturing light so that it may be magnified for viewing are Catadioptric, Newtonian Reflector and Refractor.

Refractor Telescope

The traditional long-tube looking telescope. The Refractor uses lenses to bend light and this causes the rays to meet at a point on the other end of the telescope. They are magnified by the eyepiece for viewing. There is a large lens on the front of the Refractor, which is the objective lens.

Pros

Requires little to no maintenance Excellent for planetary viewing

Cons

Color deviation in achromatic designs Not recommended for deep sky observation

Reflector Telescope

The Newtonian Reflector uses a primary mirror that is concave. This mirror sends light to a flat mirror which reflects the light out a side opening and to the eyepiece where it is magnified and focused.

Pros

Best for deep space observation - Great for looking at remote galaxies Delivers very bright images

Cons

Requires regular alignment Requires more complicated cleaning of mirrors than other types of the same design

Catadioptric Telescope

The last of the three types of telescopes and currently the most popular on the market. This type uses a series of lenses and mirrors that fold the light path and send it through to the primary mirror through a small hole. This allows the light to be magnified and focused for viewing. There are two types of Catadioptric telescopes - Schmidt-Cassegrain and Maksutov-Cassegrain. The Maksutov type has a concave and convex correcting lens where the light enters. The light hits the primary mirror, is sent back to the secondary mirror and finally sent to the opening in the back of the telescope.Pros

Portable and easy to use Versatile - good for deep space and planetary observation About the best for focusing Excellent optics

Cons

It does not look like a telescope to many people It is more costly than other Newtonians with the same size opening for light

Once you know what you want to look at and which of the types of telescope you should choose you need to think hard about how much you are prepared to carry around, telescopes can be bulky and your tripod and mount are essential bits of additional kit. Size determined, you are now ready to see just how much aperture you can get for your money. Don't concern yourself with magnification, it is not nearly as important as is touted and higher magnifications will cause images to be blurry because of air turbulence. The performance of a telescope depends on how much light gathering capability it has, the more light it can gather the better you will see, and this is aperture. As a general rule of thumb, once you know which of the types of telescopes is best for you, get the biggest aperture you can afford for your money.

3 Types of Telescopes - Know the Differences Or Risk Buying the Wrong One

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