It depends on the actual focal length. For a 35 mm format lens, 200 mm is about 4x magnification, to get 20x you'd need a 1000 mm lens.
For smaller formats, such as 8 mm or a camcorder, find the focal length for normal view, then multiply by 20.
15mm
18-55mm is a wide angle type lens, 55-200mm is a zoom
A zoom lens you can go from one focal length to another such as 70-200mm and a fixed is one focal length such as 50mm
The prices of a Canon EF 70-200mm lens depends on where one is purchasing the Canon EF 70-200mm lens from. This item costs $1,449.00 on the Amazon website.
Yes
There is none
Yes, you can. Any EF and EF-S lens will work on 20D.
yes
the name
This describes the focal length range of the lens. It means that the lens can be set between 18mm (a wide angle which takes in a larger field of view) and 200mm (a telephoto, which creates a narrower field of view). ******* Note: the above is certainly true for 35mm format, but focal length is relative to the format. For 4x5 cameras, the equivalent "normal" focal length is around 200mm.
That describes a telephoto lens with the lower and upper focal lengths.
The lens size is the only difference the XL have a bigger lens.
The diffrence between thick and thin lens depends on your precription for your eyes.