The entire line of D series cameras from Canon have improved auto focus, red eye reduction, tilt shift mounts, waterproof housing and a shockproof frame.
Pachelbels Canon in D is not Christmas music. Perhaps someone has combined this piece with something else, but it wouldn't have been composed by Pachelbel.
The tempo is around 60 on the quarter note. It can be slightly varied according to the performers.
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Pachelbel's Or Canon in D, by Pachelbel.
That is was composed by Johann Pachelbel and is called the Canon in D.
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There are reasonably good keyboard versions of the Canon in D.
Look up "Canon in D major for violins" in a serach engine.
Pachelbel's Canon (Canon in D Major by Johann Pachelbel)
Canon has different names around the world for their Rebel (Amateur/Consumer) line of cameras. In the US, the line is known as the Canon Rebel XSi. In Japan, it is alternatively named the Canon Kiss X2 while in Europe and around the world, it is known as the Canon 450D. Canon has done this for at least most of their Rebel cameras. The original Rebel is called the Kiss Digital; the XT is known as the 350D or Kiss Digital N; the XTi is the Kiss Digital X or 450D, the XSi is the 450D or the Kiss X2, and finally, the new XS is the 1000D or the Kiss F. However, the "***D" title (ex. 450D) is often used interchangeably with the "Rebel X**" title (ex. Rebel XSi), even in the US or Japan.
Canon in D is Pachelbel's most famous composition. It was composed in early 1600's. It is paired with a gigue in the same key.