I have had in the past Canon A1 & 20D, Olympus OM2N, NikonFE Sony A700 and after selling my Panasonic GF1 which I did not like, my son advised me to look at Pentax (which he owns) and so a trip to SRS Microsystems I purchased a Pentax K5 with 18-135mm lens. I just wanted to get a magic Lantern book to make the camera easier to understand rather than the supplied manual, but there isn't one only for the K&, you can get for all the Canons and Nikons but not for Pentax - WHY