Hello everyone Newbie here! and I'm not shy, I have a question right away. I have a 30D, and a Canon prime lens. 35mm 1.4L. It's a really great lens. Sometimes I wonder though if there is a focusing issue and I don't know if it is me, or maybe it needs to be calibrated. The photos are tack sharp in bright daylight. amazingly tack sharp. love it! In dimmer light, they aren't always tack sharp and in fact I'm sometimes not sure WHERE it focused. It really doesn't look focused at any point on the photo. Or if focused, it's still kind of a soft focus. Not tack sharp. I also know how to change the focusing point on a 30D, there is a button that will give you a choice of where to make the focus point and when the camera doesn't seem to be focusing where I want it, I change that so that it forces it to pick the spot I want. It still doesn't always seem to be focusing where I want though. Maybe I'm not looking hard enough at the resulting photo though. Here is my method: I am almost always handheld. I only have a tiny tripod and rarely is it convenient to set it up anywhere outside. So, I set the shutter speed on 1/50 and let the camera sort out what aperture is optimal. Due to the dim light, it therefore will select a larger aperture which affects DOF. i.e. it may be 2.8, or 3.5, etc. If the lighting is better then of course it will pick a higher aperture which is a better DOF. what else can I do, if I would prefer to "travel light"? How can you tell if the lens need to be calibrated? Is there something I am doing wrong, other than the tripod issue? I also rarely change my ISO above 100 because I know higher numbers give noise. bad idea? many thanks.