I used to shoot with film in my teens with a Zenith 11, but my career took me away from photography. When I decided to "return" back in 2007, I did some research about using my old M42 lenses, which I still had (along with my Zenith). I found out that adaptors could be found for both Canon and Nikon, but they wouldn't focus to infinity on Nikon bodies, which sort of pushed me towards Canon. I then tried out a few bodies, preferring the feel of the D80 over the 400D (I also liked the feel of the 40D, but that was significantly more expensive at the time). The D80 was more expensive than the 400D (it was after all a different target market) and the D40 was lower resolution. After weighing up the options, I decided to save some money and use my old lenses with the 400D. It turned out, I didn't like the results, as even the kit lens and the Tamron I got at the same time had much better image quality and soon got the 100-400. The rest is history. Having tried to use Nikons a couple of times since, I think the menus and general ergonomics on Canon suits me better (although using full manual is a pain on xxD cameras), my only complaint is having to go delving for mirror lockup, instead of an easy to reach button. I could program one of the custom settings, but they have their own disadvantages too.