First enable the self-timer on the camera and set it to "Self timer/ remote control". After that you can use the "S" button to focus and shoot. Pressing the "S" button halfway like the regular shutter button is not possible, so you could use focus lock or disable auto-focus in cases you need more control. Additionally you can use the "2S" button to focus and shoot with a two second delay.
yes
All Canon Rebel DSLR cameras uses EF lenses that fit the Canon EF Mount.
Yes.
The... Canon EF 100mm f2.0 USM
Actually no they won't. I don't konw alot about canon cameras. but one thing I do know is that it prabably won't work. Just get a Canon flash or a Sigma flash.
Any Canon camera with the EF-S lens system will work. That includes but isn't limited to all of the rebels (XT, XtI, XS, XSI, and the new T1I). The only cameras that WON'T work with your Rebel XTI lenses are Canon 1Ds, Canon 1Ds Mark II, Canon 1Ds Mark III, Canon 5d, Canon 5D Mark II. Another other Canon digital camera will do the job. The reason that these won't work is because they are full-frame cameras, which need a larger surface area of the lens and will not accept the mount from the smaller EF-S lenses. These cameras are all professional cameras and cost a couple thousand each.
All EF series lenses will work with the film Rebel or any other EOS film body. EF-S lenses are not compatible with film cameras or full-frame digitals.
Canon employs "Reps" all over the world - these people are distributed and work alongside retailers, clubs, etc. to inform customers on an SLR purchase, as an SLR is a big purchase and should be handled. Many first time users may feel overwhelmed when learning about SLRs and DSLRs - the Representatives are trained to make the transition easier.
Canon accessories does not work on all models.
The Canon Rebel film bodies use the EF mount lenses. All modern Canon EOS cameras, including all digital EOS cameras will also accept EF mount lense. The EF and EF-S lenses are compatible with the Rebel series. However, the lenses that typically come with a Rebel (EF-S) are compatible only with Canon cameras that have a 1.6 crop factor. Cameras with the 1.3 or no crop feature will not accept the EF-S lenses. The lens mounts deeper than the mirror will tolerate.
Yes most defenitley.
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.