Not really sure I agree with this.
When I go to dofmaster, and use the T2i at 55mm f/5.6, guessing an approximate distance to the window at about 15 feet, I get:
Depth of field
Near limit 12.9 ft
Far limit 17.9 ft
Total 4.94 ft
If I then choose the Kodak z730 (same size sensor as the z612 - 1/2.5in.), at 70mm f/4.5, I get:
Depth of field
Near limit 14.7 ft
Far limit 15.3 ft
Total 0.66 ft
I liked your thought process, but I think it's incorrect. There are two things working against what you said - a wider FL on the T2i (increasing dof), and a larger f/stop (decreasing dof) on the Kodak.
As I mentioned before, it's very likely the quoted FL is a 35mm equivalent, not the actual. I can't imagine that the cameras zoom range starts at an actual 35mm with such a small sensor.
edit: just checked a few sites to verify my assumption: the stated focal range for the Kodak is it's 35mm equivalent, not the actual (35-410mm)







