Overcoming Canon’s Digital SLR Crop Factor For Wide Angle Photography

The digital SLR crop factor, or lens multiplication factor, has the effect of cropping the edges of an image and enlarging the central area. A “frame” of 35mm film is 36 x 24mm in size, while the digital sensor on Canon Digital Rebels (300D to 500D) and the EOS **D range (20D to 50D, and 7D) is only 22.5 x 15mm in size. A smaller sensor to receive the image means that some of the image will be cropped.
You get a similar result when using a digital SLR camera with a sensor that’s smaller than a piece of 35mm film — the image cast by the lens “overflows” the sensor. A genuine wide angle lens like a Canon EF 24mm gets “lengthened” by 1.6x, giving it an equivalent focal length of 38.4mm on your Rebel XSi or 50D.

Fortunately, Canon and other manufacturers of digital SLR’s realized they had to produce lenses to overcome the crop factor for photographers using wide angle lenses.

The result is a range of canon digital wide angle lens created specifically for digital SLR cameras with sensors smaller than 35mm film (often referred to as APS-C format sensors). While the crop factor still applies when using these lenses, the lenses themselves are “shorter”, both physically and in focal length, than the equivalent lens for a 35mm camera.

Thus the kit lens for Canon Rebels is the EF-S 18-55mm. To overcome this, Canon introduced two lenses that are standouts within its range of EF-S lenses for use on Rebel and EOS **D cameras:
* Canon EF-S 17-55mm f/2.8 IS USM
* Canon EF-S 10-22mm f/3.5-5.6 USM
Users like the lens for its sharp images at all focal lengths, fast autofocus, versatility and excellence in low light. The EF-S 10-22mm is remarkable as it’s the only true ultra wide angle for Canon Rebels and EOS **D bodies. Fit this lens on your Canon 40D and it’s equivalent to a 16-35mm on a 35mm or full-frame body, offering photographers creative opportunities not otherwise possible with APS-C format cameras.

Users like the lens for its sharpness, excellent colors, fast autofocus and minimal distortion. Users of Canon Rebels or EOS **D SLRs can no longer blame their kit lenses for less than stellar image quaility — alternatives are available (albeit at a price.)

Things to Consider Before Buying canon wide angle lens
The availability and the affordability of digital point and shoot and Single Reflex Lens (SLRs) cameras have paved the way for photography enthusiasts to choose the cameras that fit their style and specialization. Aside from the price and form factor, the type of lens is an important criterion to consider. The Canon Wide Angle Lens is perhaps one of the more popular choices among aficionados. The Canon Wide Angle Lens has patented technology that allows rapid focusing. It covers a wider spectrum which makes it an ideal choice for landscape and portrait shots.

While the Canon Wide Angle Lens is a popular choice, it is also important to first determine what you are really looking for in a camera lens. You also have to consider the price because lenses don’t come cheap.

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