That is a transmission type of scope, For something of this type look at a telescope or binocular store. A camera mount will be on top, (22mm) will be needed. The output of the camera signal I think is PAL thru either USB or FW 400. All you might need is screen capture once the image is on the Air. There might an app for something to help you in the store.
Hope you are figuring out your options.

SP
Here are the specs of the main one I have been looking at:
Grades 8 - College. Featuring an integral 3.0-megapixel imaging chip and a USB 2.0, plug-and-play computer interface, this microscope can capture amazing microscopic images. View captured images on your monitor or interactive whiteboard and you will appreciate their high resolution (2,048 x 1,536), true colors, and freedom from pixilation. Microscope includes Motic® Images Plus software for Windows® 2000, XP, and Macintosh® OS X; a dust cover; and instructions. View high-resolution microscopic images on your monitor or interactive whiteboard.
Monocular head with 10x, 18-mm widefield eyepiece
Quadruple, reverse-mounted nosepiece protects objectives and provides easy access to stage
DIN** EA achromatic 4x, 10x, and spring-loaded 40x parfocal and parcentric objectives
Seperate coarse and fine focus controls
1.25 N.A. Abbe condensor on spiral mount for 100x oil-immersion microscopy
Built-in mechanical stage with coaxial controls
20-W halogen illumination with intensity control
Wolfe® lifetime limited warranty (excluding bulbs, camera, and cords); 1-year warranty on internal camera
Size: 14"H x 7"W x 8"D; weight: 10.5 lbs.