Bluray to DIY laser microscope...

[Missourian]

Blu-ray player gathering dust? Turn it into a laser-scanning microscope

Not as powerful as a commerical one, but thousands cheaper.

arstechnica.com

 

[Bob Blaylock]

From the article…

Doctor Volt says they aren't sure of the magnification of their DY microscope but told a commenter that "it can resolve structures of roundabout 5 micrometers."​

Five microns is not that impressive.

My old-school normal optical microscope, slightly modified to accept a 100× oil-immersion objective with an NA of 1.25, can resolve down to about one micrometer.