This 2016 paper makes for interesting reading:
A Simple low-cost device enables four epi-illumination techniques on standard light microscopes
by Robert R. Ishmukhametov, Aidan N. Russell, Richard J. Wheeler, Ashley L. Nord & Richard M. Berry
https://www.nature.com/articles/srep20729
Low-cost epi-illumination, 4 techniques in one
Re: Low-cost epi-illumination, 4 techniques in one
Well found, Sir
Downloaded for inspiration
MichaelG.
Downloaded for inspiration
MichaelG.
Too many 'projects'