Below are interference fringe images I've acquired with a cannibalized inexpensive webcam (the guts of a Philips Vesta 675) and an inexpensive 120 mm f/8.3 achromatic refractor (one of the recent Chinese imports). By placing a Hartmann mask, consisting of two 1-inch diameter circular holes separated by a center-to-center distance of 4 inches, over the aperture of the telescope, the telescope is converted to a small Fizeau interferometer. When the telescope is focused precisely on a bright star, and if the atmospheric seeing is not too terrible, then the light from the two 1-inch mini apertures interferes and fringes result on the detector.

The CCD in the Vesta series of webcams is a 659×494 5.6 micron square-pixel Sony color CCD. The onboard electronics resamples to produce 640×480 8-bit RGB output.

Here is a 10-frame stacked image of fringes of Deneb.

Here is a 22-frame stacked image of fringes of Vega.

The following links are to a 29-second movie of Vega fringes, illustrating among other things the effects of atmospheric seeing.
   284 KB .avi    2.0 MB .mpg
The AVI file is better quality (and much smaller) than the MPG. The 10 fps video is a stretched, blurred (to remove pixel defects due to Philips driver interpolation problems), sharpened, and highly compressed copy of the original AVI captured at the telescope.