You have to block a significant chunk of aperture to get them. This is useful, however, for focussing using a bahtinov mask. https://en.m.wikipedia.org/wiki/B

You have to block a significant chunk of aperture to get them. This is useful, however, for focussing using a bahtinov mask. https://en.m.wikipedia.org/wiki/Bahtinov_mask https://en.m.wikipedia.org/wiki/Bahtinov_mask