Originally posted by cali92rs How complicated is it to use your thumb instead of pointer finger to focus?
It is a mess, because I need to undo many years of programming in my brain. Half-press requires no thought, and no extra motion. My finger is on the shutter release automatically.
The main reason people give for using back-button focus is to shuttle quickly from action shooting with AF-C, to AF-S for shooting stills. I shuttle between action and stills with User mode.
I normally have the camera in Hyper-Program, AF-S, center point, SR on. When I want to shoot action, I switch my mode dial to User1, which changes many things that I need for action shooting; TAv mode, AF-C, 25-point expandable AF point, SR off, center-weighted metering, +0.5EC. I understand using BBF with older cameras, but with the K-3's electronic buttons and User modes, BBF is an unnecessary complication, and a less sophisticated operating method, IMO.