I have many adapted lenses for my E-PL1.This morning I put on my Voigtlander 25mm/f4 and decided to experiment. I took three identical photos with the settings 'P', 'A' and 'S'. It was a sunny day so I set the aperture at f8 ( ISO 400). I found that both the 'P' and 'A' settings gave identical images (same KBs) and were impossible to differentiate (IQ, Colour, contrast etc...). The 'S' setting gave slightly overexposed images. So, if apparently if you can use 'P' ( 'Professional' according to somebody, I don't remember who, and obviously tongue in cheek) and it works well, why bother with 'A' and , especially, 'M'. There are are probably many technical, artistic, aesthetic etc.. reasons why not - and I would like to know what they are. Please educate me.