Interactive webcam calculator

When I started using a Celestron NexImage CCD camera on my 'scope I found myself performing several back of the envelope calculations to work out what the field of view and pixel resolution would be with a Barlow lens or focal reducer in place. I figured it would be easier to write a program to do it, one that you can also use by clicking here. What if you don't have a NexImage? Fortunately, Celestron's lunar and planetary imager uses the exact same Sony ICX098BQ CCD chip used by the Philips TouCam Pro/Pro II, SPC900NC and ATiK Instruments ATK-1C, among others. Enjoy!