Toaster79
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I'm interested! I never manual focus and setting the aperture is something I need to practice. Point me in the direction of that lens pal, I'd like to get myself a pressie from this crop
So the lens is back to basics meaning you are the one that has all the control of the exposure. Manual focus can be a bitch to get a grip on unless you shoot a static object as the focus distance isn't gonna change. A tripod is a savoir there.
The aperture determines how much light is gonna hit the sensor. The wider the aperture the more light hits the sensor and so is the exposure time determined. When there's enough light and the aperture is wide open, exposure times are gonna be short (1/10s is long where 1/500s is short), whereby you can always set your ISO higher to get the desired exposure time. Your exposure time is desired to be 2x the focal length. If you shoot 60mm lens the minimum exposure time would be 1/120s or as the camera sees it 1/125s. With a 300mm lens you would look for 1/600s or as the camera says 1/500s or faster.
The aperture also determines DOF (depth of field). When your aperture is wide open (1.8 for example) the dof is gonna be really shallow. BUT when your aperture is for example f16 then you get "a lot" dof. DOF is what determines how much sharpness you're gonna get in front and back of the focal point. If you have a face in your frame for example, and set the focus point on the eye, at f1.8 only the eye is gonna be sharp whereas at f16 or higher the nose in front of the face and the ears behind the focal point of the eyes are gonna be sharp.
So with a full AF lens and full automatic, the camera is gonna take control of the exposure where with a manual lens it's all up to you. There are also differences between the cameras at measuring the exposure. My camera, for example, is gonna measure the exposure by itself although it doesn't know what my aperture is. It's simply gonna measure the amount of light hitting the sensor and determine the exposure, where some cameras won't give you the luxury (don't know what you shoot and how it behaves) to do so.