Be careful with focus peaking. On many cameras, when using focus peaking in live view, the lens is set to a different aperture during the display (e.g. in very

Be careful with focus peaking. On many cameras, when using focus peaking in live view, the lens is set to a different aperture during the display (e.g. in very bright light it will stop down) and only when you take the shot does it go to your desired aperture. When you stop down, more of the frame is in focus - and focus peaking will tell you something is in focus, when it will not be in focus at your desired aperture. One way to check if your camera behaves this way is to make the aperture smaller and smaller - does the live display darken significantly? If not, then your camera is not adjusting the aperture until you take the shot. Of course, if using a fully manual lens, this is not an issue.