This Sakar Remote Shutter Release fits the Canon EOS Rebel XSi as well as the large variety of other cameras using the 'sub-mini' connection (includes Pentax *ist/DS/DS2/K200). It has a two-stage deployment, meaning it can initiate autofocus and metering separately from deploying the shutter.
Corded remote release
2-Stage activation switch with 'locked-down' position for sequential images