Usually, card or lens problem. Remove the CF card, put it back, if it doesn't work, verify card on other camera or card reader. If the card is ok, then the lens may not have good contact, or faulty. Remove lens from body, clean electrical contacts from lens mount and also from body. It may happend more often when you have a different lens maker (Sigma, Tamron..).
no
A Canon EOS 20D can be purchased from any good camera store. If they do not have it in they can order it. If someone is happy to buy online then it can be bought on Amazon.
A good place to buy the Canon EOS 20D is directly from Canon. Other good places to purchase this camera is from eBay or Amazon where one can often find discounted prices.
You cannot record video/sound with Canon EOS 20D. It takes only photos with RAW/jpg output format.
Canon replaced the 20D with the 30D that had more mexapixels and newer features. In fact, the 30D was replaced by the 40D, which was then replaced by the current (Jan. 2009) 50D camera body.
Yes, with the right adapter. There are several mounts available for this lens.
Yes, the BG-E2 battery grip will work on the Canon 40D, 20D, and 30D. It has been replaced by the BE-E2N, which supposedly has better sealing around the battery compartment.
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20d
Yes, you can. Any EF and EF-S lens will work on 20D.