I used to have this lens when I was using a 30D and it is fantastic. I brought a hood for it of ebay as it was much cheaper!. As for long exposures hurting the camera - nope I have done 6 hour star trails at 5 minute iterations on a regular basis both on the 30D and with the newer IDMK111 that I am now using. I have shot individual frames of 30 minute and 40 minute duration with no problems either and to put it in perspective, I have over 100,000 shots so far on the 1DMK111. Yes I do a lot of photography!!!
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