Cam I use a newer EF lens with a Rebel that uses EF S lenses

I have a Rebel T2i that came with EF S lenses - I want to buy a Canon 5d Mark II and am trying to find out if I can use the regular EF lenses used for the mark II on my old Rebel?  I know I can't use EF  S on the Mark II .I am trying to photograph birds and know I need a super telephoto lens I have the EF S 55-250 but need more  - hope since I plan to get the markII that I can get a lens that will work on both cams for now. I have been told that using a super telephoto lens on the mark II or a full frame camera  is counter productive .Do you all agree?  thanks

carolyn,
If I may add a step in your bird photography, I suggest you load Photo Shop Elements, it came free with your camera (?), on your computer and learn how to use it.
Consider these figures before you lay your money down.
The 55-250mm you already have acts like a 88-400mm on your T2i. The addition of a 400mm lens, zoom or prime, for the 5D Mk II is going to show the same size photograph.
A 400mm lens on your T2i will act like a 640mm lens.
One thing I have noticed over the years is most people use a zoom lens at the long end. Otherwise, I mean if you get the 100-400mm zoom, I bet you use the 400mm side way more than the 100mm side. Somethign to consider! That said the 100-400mm zoom is still my choice over the 400mm prime.
EOS 1Ds Mk III, EOS 1D Mk IV EF 50mm f1.2 L, EF 24-70mm f2.8 L,
EF 70-200mm f2.8 L IS II, Sigma 120-300mm f2.8 EX APO
Photoshop CS6, ACR 8.7, Lightroom 5.7

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