I bought a Pentax Optio 50 and I seem to be getting a lot of blurry pictures. Has anyone had this camera? Is there something I am doing wrong? The focus options (Std and Infinity) don't have very good descriptions in the book. When I hold the shutter half-way, sometimes the focus turns red, sometimes green, and even when I take it on green (which I assume means it is focused correctly) I get blurry pics sometimes. Is this just a crappy camera?