a Newtonian telescope design program. It ray traces the
telescope checking for vignetting, optimizes diagonal size,
calculates baffle size and position, and a lot more. It allows
you to easily and quickly change any of the design parameters of
the telescope and to see the results immediately.
Display a side view of a Newtonian
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%
Load and Save files.
Eyepiece table includes focal length, power,
exit pupil, apparent field, and true field.
Check for minimum useable diagonal minor
Check for vignetting at the focuser.
Check for vignetting of true field by top of
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 will probably not print correctly on most modern
Newt version 2.5 runs under Windows 3.1, 95,
98, ME, NT, 2000, or XP.
Newt is was written,
published and is owned by
This page is
published with permission.
Newt is "freeware".
No donations or payment is required. Use it and enjoy.
If you'd like to go
directly to Dale Keller's Newt page, please click
DOWNLOAD NEWT now.
Here is a WEB version of NEWT available on the
Stellafane website. It works great.