Lens shift knobs
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Lens shift knobs

Here, you can see one of this early prototype camera's lens-shift display windows, as well as a peak of that second shift knob. These show you how far you've currently got the lens shifted. This value is saved into the EXIF data for the files, for later reference.

So, on the XT camera, you have the dual-action shutter button and two shift knobs - how do you go about controlling the rest of the camera?