Originally posted by clackers Very interesting! Nice depth of field being 25mm.
False. Depth of field is proportional to
magnification (and also to aperture value and confusion circle diameter).
So at i.e. 1:1 and F/8, a 25mm, a 100mm or even a 200mm will provide the same depth of field (but not the same bokeh, the latter one will be the smoothest).
This kind of mistake is very common, I don't know why.
Well, there are many ways to get 5:1 magnification (macro lens and bellows/extension tube/helicoid tube, macro lens and close-up, microscope lens and so on) but this lens has an advantage: it goes from 2.5:1 to 5:1. Using a bellows or helicoid tube, it is possible to do the same (but not versatile) but if you use close-up or extension tube I wish you good luck...