Re: 30D 1.6 crop
For a given lens focal length, multiply by 1.6 to get the effective FOV. For example, when using a 50mm lens, it is cropped by the decrease in sensor size to effectively be 50mm x 1.6 = 80mm...the same FOV as if an 80mm lens was placed on a full frame camera.
Your cropped body does not magnify...it crops the image circle created by a given lens...this means that tele lenses have more reach, and wide angle lenses are not as wide. A cropped sensor is great for shots requiring lots of reach, and for photographers that are not willing to pay thousands of $'s for a 400mm, 500mm, or 600mm tele lens.
So if you want the reach of say 80mm, then use a 50mm lens. If you want the reach of 160mm, then use a 100mm lens, etc, etc.
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