These are scientific grade apertures and have been utilized by universities and laboratories. The second photo shows the pinhole at 800x under the microscope.
1.0mm Laserdrilled Pinhole Large 1" SLR DSLR Canon EOS Nikon Camera photography
0.15mm Laserdrilled Pinhole Large 1" SLR DSLR Canon EOS Nikon Camera photography
0.05mm Laserdrilled Pinhole Large 1/2" holder for telescope foucault tester
0.2mm DIY Laser drilled Pinhole for Wide Angle Photography Short Focus Camera
0.15mm Laser drilled Pinhole Photography Camera Leica M Voigtlander Rangefinder
0.15mm and 0.2mm Photon drilled Pinhole Photography Camera
