Originally posted by ElJamoquio Towards the macro-end of things the DOF is often approximated to be independent of focal length.
Yep but i actually said it wrong, the with retrofocus lenses so that accounts most lenses wider then register distance the pupil magnification is higer then 1 so that mens that the pentax 35mm has less DOF actually then the 100mm at the same magnification.
And DOF is actually calculated by effective aperture and with the magnification... some like to use focal length and focus distance instead, but that's the same as magnification though
And with the same magnification and the same effective aperture you get the same DOF off course, also with normal photography
@cak if you have actually read the page that you link you will also read that focal length doesnt matter for DOF but the magnification does, that's not only for macro photography but all photography.
Beside that i never said that it's relevant with all photography except if you want to be 100% correct, then you must include it
But anyway he says that a magnification of 0,1 is enough, you know most lenses can focus twice as close, the 18-55 kit lens goes to 0,34 even
So where you get the idea from that you need extension tubes or such is beyond me...