Welcome to Stellar Products


Repeating the Experiment that Made Einstein Famous


My success measured the solar deflection of stars during the August 21, 2017 total solar eclipse to the highest precision ever realized


In 1919, shortly after Einstein’s theory of General Relativity predicted a very small effect, teams of scientists attempted to measure this effect during an eclipse seen in Africa and Brazil.  The results made front-page headlines and catapulted Einstein to world-wide fame.  The experiment is very difficult, and even after additional attempts as recently as 1973, the eclipse results have never been better than about 6%. With modern technology (an NP101is telescope provided by Tele Vue, a Microline ML8051CCD camera provided by Finger Lakes, and a tripod provided by Software Bisque), this historic experiment was repeated without an army of workers moving 6 tons of equipment to another continent.  With astrometric advice from the US Naval Observatory and careful preparation, I set up in Wyoming to perform this experiment, the most difficult challenge of my career. I completed the experiment with a precision of 3%. 


Results: Perfect focus, perfect exposures, perfect timing, perfect tracking, no wind, no clouds, excellent seeing.  For the first time since 1919, everything worked as planned!


May 14, 2018:  The analysis is completed and published in Classical and Quantum Gravity.  Result: L = 1.7512, in perfect agreement with the theoretical value. 



(Left) Don and Carol, next to equipment on custom base built by Steve Lang.  (Center) My measured deflections, scaled 800x. (Right) Deflections Measured in1922, scaled 2250x.

(Clicking on any image takes you my 2017 experiment web page.)

Astronomy Links

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Jupiter, April 9, 2004 (my highest resolution Jovian image)

Stellar Products was the first company to manufacture standard adaptive optics systems to both amateur and professional astronomers. The AO-2 adaptive optics system provided image stabilization for planetary photography. The AO-5 adaptive optics system will provide correction of defocus and astigmatism as well as image stabilization. Either of these systems allows the astronomer to improve his images to the limit of his telescope.

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Mars, August 9, 2003, using a webcam


Saturn, December 29, 2000, using AO-2 system


Jupiter, January 7, 2001, using AO-2 system

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(For best viewing, please maximize your monitor brightness and adjust the contrast until you can see each of the 17 gray scales shown here)

Archived Images and Movies of Jupiter, Saturn, Venus, a Pluto occultation, Galaxies, and a Globular star cluster are posted in the Image Gallery (updated November 2018).

FOR MORE INFORMATION, click on these links:

Image Gallery

Adaptive Optics Tutorials and Products

About Stellar Products

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All content is Copyright 2005-2019 by Don Bruns

All text and images are owned by Stellar Products, 1992-2018. Any use by others without permission of Stellar Products is prohibited. For information on commercial use of any of these images, click here.

Web page last updated May 2, 2019.