All canon EF and EFS lenses fit on all canon dslr's
EF and EF-S lenses can be used on 400d. There is a lot of lenses out there.
All Canon Rebel DSLR cameras uses EF lenses that fit the Canon EF Mount.
Any canon ef or efs lenses will fit on all of canon's dslr
Yep.
If you're buying Canon lenses, you'll need the EF-Slenses for your 1100d.
All lenses that have a "ef" or "ef-s" mount can work on a canon 50d. Be mindful, if you decide to go with a fill frame camera later on, the "ef-s" lenses will create heavy vignetting on those cameras?
No, EF-S lenses are designed specifically for Canon cameras with APS-C sensors and have a smaller mount than EF lenses, which are compatible with full-frame Canon cameras.
the T70 uses an FD lense, which cannot be fitted onto the new range of canon digital SLR cameras which use EF and EF-1 lenses
No, EF-M lenses are not compatible with EF mounts. EF-M lenses are specifically designed for Canon's mirrorless cameras, while EF lenses are designed for Canon's DSLR cameras with EF mounts.
All Canon Rebels can use either Canon EF (or compatible) or Canon EF-S lenses. EF lenses can be used on any Canon EOS camera. EF-S lenses, introduced in 2003, are made specifically for Canon EOS cameras with APS-C size (22.2 x 14.8mm) sensor. They can be used only on Canon Rebel cameras and on the Canon 20D, 30D, 40D, and 50D cameras (as of 2008). No other manufactuer currently makes camera bodies that take EF lenses. (Several years ago, Kodak had a full-frame digital camera that took EF lenses. It was a camera that was OK in the studio, but inferior for general photographic use. It was discontinued shortly after introduction.)
EF lenses are compatible with all Canon cameras, while EF-S lenses are designed specifically for Canon APS-C sensor cameras. EF-M lenses are designed for Canon mirrorless cameras. EF lenses offer the most versatility in terms of compatibility, while EF-S and EF-M lenses are more limited in their compatibility but are optimized for specific camera types.
The key differences between Canon EF-M and EF-S lenses are their compatibility and size. EF-M lenses are designed for Canon mirrorless cameras, while EF-S lenses are for Canon DSLR cameras. If you have a mirrorless camera, EF-M lenses would be more suitable. If you have a DSLR camera, EF-S lenses would be the better choice.