How depth of field works in a macro image

Many people only learn about how aperture controls depth of field, but there's a lot more to it than that. Proximity and focal length also matter quite a bit. Here at Camera Lessons Online July is macro month and so we'll discuss why you always get a shallow depth of field when shooting this type of imagery, nearly independent of aperture.

As you may know, the first product we made here was our iBook "Macro Photography: Zero to Sixty" which you can read about here:
Or here on our website:

Thanks for watching and enjoy.

[aamsergie]

Can you comment on the difference between a full frame vs apsc on DOF.