Modifications
A number of modifications to the T90 have been performed over the years, by Canon or third parties, in order to add features missing from the camera as-built:
- PC flash sync socket: As built, the T90 lacks a separate flash sync socket. The addition of one could be performed by request by Canon support centers. If so modified, it is fitted on the left-hand side of the prism housing, as seen by the user.
- Vertical shutter release: actually an accessory, since it requires no camera modification. A vertical shutter release, convenient to the right index finger when holding the camera vertically, was available from Canon Professional. It fits into the remote control socket on the camera at that location.
- Mirror lock-up: Canon considered the mirror in the T90 sufficiently damped as to need no mirror lock-up feature. Many users disagree, and instructions on how to modify the camera to add this feature are available.
- Leader-out film rewind: Photographers who like to change film mid-roll prefer the film leader to be left out when the film is rewound, so they do not have to fish for it with a leader retrieval tool. Instructions on how to perform a modification to enable this are detailed online. Since the modification consists only of connecting two solder pads on a circuit board with a wire, clearly the capability was built in to the camera's electronics but not enabled.
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