Lens aperture is one of the key tools for photographers for adjusting the exposure and for achieving specific creative depth of field effects. The lens aperture is an adjustable hole created by a diaphragm within the camera lens. When you change the size of this hole, you change the amount of light allowed to pass […]
Depth of field
Depth of field is the near-to-far sharpness in a picture. If both foreground and distant objects are sharp, there's lot's of depth of field. If only the subject is sharp and the foreground and background are blurred, it's shallow depth of field. Both are fine, depending on the effect you're trying to achieve in your picture. Depth of field is affected by the lens focal length (longer focal lengths produce shallower depth of field), the lens aperture (wider apertures produce shallower depth of field) and focus distance – the closer your subject the shallower the depth of field. Shallow depth of field can product attractive background blur in portrait shots, for example. This is often referred to as 'bokeh', though bokeh is actually something slightly different.
Depth of field is the near to far sharpness in your pictures. A picture with shallow depth of field has only the main subject in focus, and everything in front of it and behind it is blurred. The opposite is a picture with deep depth of field, where everything is sharp from right up close […]
The advantage of interchangeable lens cameras like DSLRs and mirrorless cameras is that you can change lenses for different kinds of photography. There are many different types of lenses, often with specific names. Lenses are usually characterised or grouped by their focal length. It might be more useful to use their angle of view instead, […]