I would like to know whether it is possible to photograph moon without any flaws with a canon EOS 550d..
Also to get an image of the moon as close as the following image, what kind of equipment(lens,etc) is need to be used with the 550d Body
Answer
You can certainly take such an image with a 550D, but to get it that size without cropping will take a lens of about 1200mm or so. The moon occupies about one-half degree of arc, and a 1200mm lens on the 550D's sensor will yield a (short-side) field of view of just under three-quarters of a degree, which is just a little bit tighter than the framing here. An 800mm lens with a 1.4x teleconverter will yield almost exactly the same framing as this picture. A 600mm with a 2x teleconverter will be just a bit tighter.
If the image is for screen display or a small print, don't be afraid to shoot at 300mm and crop. You'll still wind up with an image that's about 1730x2600 pixels, which is bigger than most monitors and will print a reasonable-quality 8x10 or 8x12 (or a superb 6x9).
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