Where lens settings live
“Camera lens settings” can mean two things. Some are physical controls on the lens barrel: switches and rings. Others are exposure settings, such as aperture, shutter speed and ISO, that you set on the camera but which depend on what the lens can do. Which controls you have varies by brand and model, and cheaper or older lenses may have only a focus ring and a zoom ring. Check your lens manual for specifics.
If you want background on lens types first, start with camera lens basics.
AF/MF switch and focus ring
The AF/MF switch toggles between autofocus and manual focus. In manual focus you turn the focus ring yourself. Many modern lenses use focus-by-wire, where the ring sends signals to the motor instead of moving the glass directly, so the feel can differ between lenses.
Some lenses allow manual adjustment after autofocus locks (often called full-time manual focus), but not all do. Check your manual before turning the ring on a lens set to AF, because on some older designs this can strain the mechanism.
Manual focus is useful for macro work, shooting through glass or fences, low-light scenes where autofocus hunts, and astrophotography.
Focus distance limiter
Some telephoto and macro lenses have a limiter with choices such as Full and a restricted range, for example a minimum distance to infinity. Limiting the range stops autofocus from searching through the whole distance scale, which can speed up focusing when your subject is far away. Switch back to Full when you move closer, or the lens may refuse to focus.
Image stabilisation switch and modes
Optical stabilisation, branded IS, VR, OSS or similar, compensates for small hand movements, letting you use a slower shutter speed than normal. Points to know:
- It helps with camera shake but does not stop subject motion.
- Some lenses offer a second mode for panning. This lets you follow a moving subject horizontally without the stabiliser fighting you.
- Many manufacturers suggest turning it off on a tripod, although modern systems often handle this automatically. Your manual will say.
- Cameras with in-body stabilisation may combine it with the lens system, or have its own switch in the menu.
Zoom ring and zoom lock
The zoom ring changes focal length. Some zoom lenses can extend under their own weight when pointed downward, a behaviour called zoom creep. A zoom lock switch holds the lens at its shortest setting when you carry it.
Aperture ring and custom control ring
Some lenses, especially manual-focus designs and certain mirrorless primes, have a physical aperture ring marked in f-stops. It may be clicked or declicked, the latter being popular with video shooters. Other lenses have a customisable control ring that you can assign to aperture, ISO, exposure compensation or other functions in the camera menu.
Settings that sit on the camera but affect the lens
- Aperture (f-stop): A low number, such as f/1.8, means a wide opening, more light and shallower depth of field. A high number, such as f/11, gives a smaller opening and more depth of field.
- Shutter speed: Fast speeds freeze motion; slow speeds blur it and usually need a tripod or stabilisation.
- ISO: Raises sensitivity, and generally adds noise as it increases.
Most lenses are sharpest somewhere in the middle of their aperture range rather than wide open or fully stopped down, because diffraction softens images at very small apertures. The exact sweet spot differs by lens.
Practical starting points
- Everyday shooting: autofocus on, stabilisation on if available, focus limiter on Full.
- Tripod landscapes: consider manual focus, and check your manual on stabilisation.
- Distant action with a telephoto: use a limiter if it has one, and a panning mode for horizontal movement.
- Portraits: a wide aperture for background separation; see the best lens for portrait photography for focal length ideas.