Single lens objective refractor

OK, here is another one of my harebrained ideas that is probably
flawed in some obvious way that you fine people will point out to me.
But here goes.

It seems to me, with the advent of digital cameras and computer
graphics, you could build a single objective lens refractor and fix
chromatic aberration with PhotoShop. You could take three pictures.
The first focused in the blue part of the spectrum, the second in the
mid frequencies, and the last in the red zone.

Extract the cyan and black from the first, yellow and black from the
second and red and black from the third. Than, using PhotoShop
carefully resize the blue and red images to the same size as the
yellow. Finally using something like Registar stack them together.

Another dumb idea brought to you by,
James King