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While there Adobe Standard profiles for Olymus cameras there are no actual camera matching profiles as there are for Nikon and Canon. Why is this? I and many others would like to see them, particularly for the E-3.
Because it hasn't been a high enough priority yet, given the smaller market share. Make your voice heard, submit a feature request! (Link on the blue bar at the top).
I'm not exactly sure what the "Nikonons" have. The Olympus E-3 has Picture Modes for Vivid, Natural, Muted, Portrait, Monotone and Custom. Each of these are customisable for contrast, sharpness and saturation 2 stops either side of the preset. It also has Gradation settings (for filling shadows) of Normal, High Key, Low Key and Auto. It has settable noise filtering and noise reduction features.
I'm no expert on the other Olympus SLRs but they have similar functions. The newer E-3' and E-62' additionally have the usual scene selection modes plus Art Filters for Pop Art, Soft Focus, Pale & Light Colour, Light Tone, Grainy Film and Pin Hole; see http://www.exploreyourworld.com.au/olympusartfilter/ . Personally I prefer the professional austerity of the E-3 but I'm sure the E-3' and E-62' are every bit as capable and perhaps more fun.
Because it hasn't been a high enough priority yet, given the smaller market share. Make your voice heard, submit a feature request! (Link on the blue bar at the top).