Some weeks ago browsing aimlessly (I was looking at the price of various photo gear) I noticed the Photon Photography Course, the price looked right to me so I decided to enrol myself, trying to improve my skills. It started this week-end with a couple of theory lessons. Not something really new for me and not very deep, but basic knowledge for any photographer.
So after the first course, I made a couple of photo experiments showing the dependency if aperture size (F number) and the depth of field. The range of aperture values is not very large, just as my main (telephoto) lens allows (F3.5 is my limit):
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