If you're buying Canon lenses, you'll need the EF-Slenses for your 1100d.
Yes. Canon EOS film cameras uses EF-mount lenses. All Canon EOS Digital cameras will also accept EF-mount lenses.
All of canon's EF-mount lenses will fit on all camera bodies in the Canon EOS system. Simply, if the lens says "EF" on it, then it will fit any Canon camera that says "EOS" on it. If it says EF-S on it, it won't fit on a EOS film body or a full-frame digital. EF-S lenses only work on EOS digital SLRs with APS-C sized sensors (Digital Rebel and 10/20/30/40/50D series) If it says FD on it, it won't fit on any EOS body. These are the old manual-focus lenses from the 70's and early 80's.
Vivitar makes lenses for several different camera mounts including Canon. A particular lens may fit or not depending on the mount.
Absolutely yes. Canon EOS 450D has the same mount as Canon EOS 400D, wich is EF and EF-S.
All canon EF and EFS lenses fit on all canon dslr's
Unfortuntely, No you can not use the AE1 Program lenses with Canon EOS cameras. They use different types of lenses, thus the diameter, connections and mount are different.
No, not without an adapter. There are adapters avalable that lets you mount FD-lenses on newer Canon EOS cameras with EF-mount
Any canon ef or efs lenses will fit on all of canon's dslr
The short answer is "Yes." The long answer is: All Canon EOS cameras use Canon EF (electro-focus) lenses. They can also use independently made lenses with EF type camera mounts. All Canon DSLR (digital single lens reflex) cameras can use all Canon EF (or independent manufacturer equivalent) lenses made for film or digital cameras. Most Canon DSLR's have an APS-C sensor that measures 22.2 x 14.8mm. (This is smaller than the 36 x 24mm image size on 35mm film.) In 2003, Canon introduced EF-S lenses that were optimized for the APS-C sensor size. The EF-S lenses will only fit on Canon 20D, 30D, 40D, and 50D cameras (as of 2008) and all Canon Digital Rebel cameras.
I don't think they will fit any. The lens mount was changed right after the Canon T70. Someone told me they will fit a Nikon so I'm trying to find that out. (They don't fit Nikon cameras.) Canon T70 lenses only fit Canon SLR's (single lens reflex) made between 1964 to 1987. The T70 uses Canon FD mount lenses. FD lenses can only be focused manually. All of the exposure communication connections between the camera and lens are mechanical. An EF lens will not fit onto an FD body. In 1987, Canon introduced EOS cameras that use EF (electro-focus) lenses. All of the exposure and focusing communication connections between the camera and lens are electrical. An FD lens will not fit directly on to any EOS camera. The Rebel XSi camera is a Canon EOS digital camera that can use EF lenses or the smaller EF-S lenses made for APS-C DSLR's. Adaptors are available on a popular internet auction site that will connect an FD lens to an EOS body. The price in 2008 is just under $40, including shipping. Lens functions are manually adjustable only, and are not very convenient when used in this way.
In short, yes. More specifically, as long your zoom lens is an "EF" mount lens, it will work with all Canon Digital-SLR models from the EOS line. You can determine if a lens is an EF mount from the full name of the lens. The full name of the lens is usually written on the outside of the len itself.
The short answer is: "No" The long answer is: The T70 uses Canon FD mount lenses. FD lenses can only be focused manually. All of the exposure communication connections between the camera and lens are mechanical. An EF lens will not fit onto an FD body. In 1987, Canon introduced EOS cameras that use EF (electro-focus) lenses. All of the exposure and focusing communication connections between the camera and lens are electrical. An FD lens will not fit directly on to any EOS camera. The Rebel XSi camera is a Canon EOS digital camera that can use EF lenses or the smaller EF-S lenses made for APS-C DSLR's. Adaptors are available on a popular internet auction site that will connect an FD lens to an EOS body. The price in 2008 is just under $40, including shipping. Lens functions are manually adjustable only, and are not very convenient when used in this way.