Nikon A1, A1 Plus, A1HD25, A1RHD25, AX, AXR
This is part of the Backprojected Pinhole Calculator.
Details
The pinhole size, reported in microns, is the largest diameter of the hexagonal pinhole. This pinhole covers about 83% of the area of a circle with the same diameter. The microscope does not have an additional internal magnification.
Calculator