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Extra Lens
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If your thinking about getting your hands on a Rebel T1i Video Camera, you'll be in good company. It's a good camera, especially for shooting video, but you it's not without a few caveats. Let's have a look at a few pros and cons shall we.

Unfortunately for an overwhelmed camera purchaser, that's far from the truth. There were better existing image sensors (Canon 40D) that could have been selected when designing the T1i.

I'm certain you've read in some of my other articles, that cramming more megapixels doesn't guarantee good pictures. The image sensor needs to be designed to cope with more megapixels.

The APS-C image sensor employed in the Rebel SLR T1i, is a tiny bit smaller than the DX image sensor used by the Nikon D90 12.3MP. Obviously there are different approaches to get extra pixels into a smaller box. Using smaller pixels, and squishing them closer than before. A more correct indicator of picture quality than mega-pixels, is pixel density. In this case, the D90 SLR comes in with much better numbers (lower is better here) of 3.3 vs 4.5 for the T1i.

Having excessive pixels on a image sensor can cause several issues. As you go on the hunt for extra lenses, you'll quickly learn, that more megapixels usually means spending more money on higher priced lenses. A high resolution, DSLR equals a higher resolution resolving lens, which means spending extra bucks.

Strangely enough, the lens that's usually supplied (EF-S 18-55mm f/3.5-5.6 IS) by Canon with the T1i SLR, is not a model that is particularly adept at managing large megapixel resolution cameras. In my judgment, a better choice for the Rebel T1i would have been the albeit more expensive 18-200mm Canon EF-S.

Other important DSLR features, like diffraction, ISO, and dynamic range can be affected by too much pixel density. I don't know about you, but I'm convinced, that getting 2.8 less megapixels from the Nikon D90 12.3MP for more money, may be better value for my bank account.

A reputable evaluate of sensors using RAW data, is provided by Dx O Mark. Dx O Mark testing is not yet available, but the Rebel SLR T1i uses the Canon 50D SLR sensor. The testing has shown, that the D90 SLR image sensor is superior to the EOS 50D sensor. There's significant thinking to believe that future Rebel T1i test results will be very similar to the Canon EOS 50D data.

Getting a Rebel T1i Video Camera is never an easy thing, especially with the way digital technology is constantly changing. Fortunately, there are plenty of helpful websites online, that can narrow down your search and help you find the Rebel T1i Video Camera with all the features important to you

Do You Need Contact Lens

Are you about to venture into the world of wearing contacts? Many people in need of corrective lenses choose to wear contact lenses because of the comfort and an aversion to looking awful with glasses. Glasses slip down your nose, weight on your ears and nose, and have glare problems with light. You also have to have special lenses or an extra pair to keep the sun from blinding you when wearing glasses. A contact lens allows you to get rid of this paraphernalia and simply have corrected vision. Most individuals won't even realize you are wearing a contact lens because they are virtually impossible to see in your eye.

Contact lenses have changed since the 50's. A hard contact lens was the first lens to be made. This type of contact lens was made of a glass material making it very rigid and very uncomfortable for your eye. Most individuals felt glasses were the only way to go because of the uncomfortable material and expense. After all it was very easy to scratch your eye with a hard contact lens when trying to get it out because of the rigidity of the material. Soon glass material was replaced with a polymer based product making contact lenses a little more comfortable; however the restricted oxygen flow to the cornea was causing eye sight problems like blindness in individuals who wore contacts for several years.

We now have a silicon hydrogel contact. This is known as a soft contact lens. The material is like plastic and conforms to the eye easier than their counterparts. It is also thinner. This thinner material tends to tear easily, but gives more comfort to your eye. It is an almost weightless material so your eye will barely feel its presence.

With the introduction of the silicon hydrogel contact lens we also have the introduction of more color contact lenses available. You may have seen some one with violet, jade, yellow or red eyes. The color contact lenses are available to create whatever effect you wish to, however there are downsides. The color contact lens tends to restrict oxygen flow when you have these type of opaque lenses because the material is a little heavier to create the affect.

Your contact lens is created to fit your eye. An eye care specialist will measure your eye to get the correct lens ordered to fit your eye. This is why most individuals with higher prescriptions tend to wait a week or more for their contact lenses to arrive. You can also have corrective lenses for astigmatisms or bifocal contact lenses. The Toric lenses are weighted at the bottom to keep the contact on your eye and eliminate the blurriness created by the astigmatism. The bifocal contact lens is available for those who need an adjustment for near and farsightedness and don't want glasses. Your eye care professional will make sure you have the right prescription for your contact lens.

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Will a reverse lens work on a point and shoot camera? If you get an extra lens, and tape it onto the built one?

NO.

Taking the classroom outside
Wendy Banning was a co-founder of Pittsboro's Community Independent School in 1992 and created its outdoor learning policy.

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