Having a Hard time deciding now....5DM2 or 7D for lowlight shots.

[Exact]

I don't have the T2i, but I do have the 7D and 5D2. The 5D2 is marginally better, but the 7D will do a great job, especially if you are willing to use post production tools, like Neat Video.

Realize that the 5D2 will be harder to work with at wide open apertures because the DOF will give you much less room for focus errors.

If you are shooting at high ISO on ANY camera you probably want to invest in Neat Video anyway....

 

[jdv]

I don't have the T2i, but I do have the 7D and 5D2. The 5D2 is marginally better, but the 7D will do a great job, especially if you are willing to use post production tools, like Neat Video.

It's just about a stop faster. Add to that a higher ISO number before grain becomes a factor and the difference is more than marginally better. See this in depth explanation:
http://blog.lux-sf.com/?p=280

In other words, it's a nice little chunk better.

That said, the 7D and T2 are still pretty darn sensitive and can def produce great images at night. Expect a higher ISO setting and you'll need fast glass - but it's workable.

But if light sensitivity is key - if the whole film is shot in the dark, I'd think the Mark II is a no brainer (other than it's nearly $1,700 more then a T2, which is regarded by some as having the better video between it and the 7D).