I have a Panasonic GF1 with the 20mm 1,7 lens. I use the manual mode alot and think its abit anoying with all those steps in aperture and shutterspeed. For example the aperture starts with 1,7 and then 1,8 and 2,0. I think it uses third steps. Is there a menu so I can change to half steps or maybe even hole steps?