>implying t2i users don't know shit about cameras.
Well, your argument is 90% wrong. There are no electronic connections on the lens in the first place.
ex. 1: bottom of my lens
The reason why this worked with some, but not all of the cameras, is because there is a small mechanical lever in the lens (pic didn't capture it, sorry). When stopped down all the way, the lever can move the aperture through the full range, if at a different stop, it can only max out at that particular stop. The ONLY reason it works on some Nikon cams and not the others is because they don't have this lever installed or it doesn't line up with the lens. It has nothing to do with electronics in any way.
Most canon-nikon adapters don't even have electronic communication in them like you assumed (most people adapting glass are probably smart enough to handle a manual lens to begin with, there isn't a real need for it). Unless you got one of them (and I'm not sure as to how well they work) that would be the only time you could communicate between a camera, but this lens doesn't even have electronics. And the lever? covered up by any canon adapter, and a canon camera most certainly wouldn't have the same lever in the first place.
So next time we try to hijack a thread, lets do a little research before jumping to conclusions. Also, I'm a t2i guy, want to take back the implication?
And mander, this is what a manual lens looks like:
the ring on the bottom with the stops is twisted to change the aperture. Very convenient, just twist and shoot!