Newt 0.25

* Display a side view of a Newtonian telescope.
* Modify parameters like mirror diameter, diagonal minor axis, focuser height, focuser inside diameter, tube inside diameter and thickness, and many more.
* Use inches, centimeters, or millimeters as the unit of measure.
* Calculate baffle size and placement.
* Calculate diagonal offset.
* Calculate fields of 100% and 75% illumination.
* Load and Save files.
* Eyepiece table includes focal length, power, exit pupil, apparent field, and true field.
* Check for minimum useable diagonal minor axis.
* Check for vignetting at the focuser.
* Check for vignetting of true field by top of tube.
* Calculate obstruction percentages for light loss and contrast reduction.
* Cast three rays through telescope - an on-center ray, a 100% light zone ray, and a 75% light zone ray. Use these to check for vignetting at focuser, true field cutoff, etc.
* Print specifications and dimensions to a printer (see note).

**NOTE: There is a bug in the printer code. It may not print correctly on most modern printers. Sorry. It was written for Windows 3 about a million years ago, and hasn't been updated since then.

Newt Requirements:

* Newt runs under Windows 3.1, 95, 98, ME, NT, 2000, or XP.

**NOTE: The installer may not work on Windows Vista or Windows 7, but the program itself will work if you can manage to extract the files from the installer package. Just copy all the files to a folder and try it out. It has been reported that it does not work correctly on 64-bit operating systems.