I am going to break stride and suggest you shoot indoor architecture from a tripod. Shoot at f8 and don't worry about the shake or ISO because you are on a tripod. You will want to pick up a radio trigger, too. The Yungnuo is cheap and it works. As far as IS lenses are concerned, The Tamron 17-50 f2.8 is decent, but I think you should skip the IS and ...
My primary recommendation would be 18-135mm f/3.5-5.6 IS nano USM lens.
The reason is that most crop zoom lenses are really poor in sharpness, this one is a bit less poor than others. But only by a bit. (The 17-55mm f/2.8 would be a bit less poor in sharpness if you nail focus and won't fully zoom in to >50mm, but read on for its focus problems.)
Also, the ...
If all of your lenses do this on the Rebel XTi/400D and none of them do it on another Canon EOS camera, then at first glance the issue would seem to be with the camera body.
The more I think about it, the more it seems to me the problem here has to be in the camera body, since voltage is being supplied to the lens even when the camera is turned off. It ...
Ok, I found some specs and reviews. Glidecam 2000 Pro is not an optimal choice for mirrorless, because:
The Pro is made for cameras and camcorders weighing between 2 and 6
pounds. Oddly, if the camera is too light, the Pro seems to be harder
I won't risk and find something smaller.