Well to the contrary to what everyone said,

take a look at http://www.sae.org/students/aerodes.htm

SAE Aerodesign competition 1 O.S. 0.61 FX can carry 33lbs of load+airframe in 10' plane and can take off in 200ft.

See the photos of the planes. http://www.sae.org/students/ade2004pics.htm

I bet 2 O.S. 25FX's can lift 13lbs payload if a single .61FX can lift 33lbs with a proper airfoil and airframe.

But of course there are easier ways to do this and I personally won't put a pro camera weighing 13lbs(sounds expensive) on 2x .25s.