3 ms·

As far as I know the problem is that the amount of light that goes trough the hole is very low and you cannot see much or you need a very strong light source.

• Sharlin 14y ago
  Or you have to expose for a long time.
  • Luc 14y ago
    Or use more than one pinhole... E.g. http://pinhole.stanford.edu/zp.html http://pinhole.stanford.edu/zp.html