yeah that is true that those lenses will work with newer canon bodies but i am not 100% on that. But what you can do is go to best buy and see if they fit on the new cameras and if they do then you are set!! but if you want video you are going to have to get no older then a 2 year old basic model DSLR. unless you purchase the professional level DSLR. And for auto focus on the video part not many DSLRs will focus continuosly the best advice i can give towards that is get either the 28mm 1.8 <-- (lense aperture) or 50mm 2.0 i believe. the lenses that dont move are the best for video and the lower the aperture the better. lets in more light AKA speeds up the shutter speed when you are trying to take pictures in darkers areas