Pinhole marker or Purkinje images of the microscope can be used to get a centrally located pupil and the pinhole pupil size to 1.5 mm. A pinhole marker (Figure 5) sized 1.5 mm is employed for gauging ...

On most of the occasions that I write about microscopy, I talk about big table-top devices with fancy lasers attached to one end and fancy geeks attached to the other. Yet, in my excitement over these ...