UNDERSTANDING CAMERA LENSES - Cambridge in Colour
For users of digital cameras with cropped sensors, one needs to convert into a 35 mm equivalent focal length. ZOOM LENSES vs. PRIME LENSES. A zoom lens is one where the …
Understanding Depth of Field in Photography - Cambridge in Colour
On the other hand, when standing in the same place and focusing on a subject at the same distance, a longer focal length lens will have a shallower depth of field (even though the …
CAMERAS vs. THE HUMAN EYE - Cambridge in Colour
Incidentally, this is close to a 50 mm "normal" focal length lens on a full frame camera (43 mm to be precise), or a 27 mm focal length on a camera with a 1.6X crop factor. Although this doesn't …
MACRO EXTENSION TUBES & CLOSE-UP LENSES - Cambridge in …
An extension tube increases lens magnification by an amount equal to the extension distance divided by the lens focal length. For example, adding a 25 mm extension tube to a 50 mm lens …
Focal length vs focal distance - Cambridge in Colour
2009年9月30日 · Focal length is the length in mm between the front part of the lens and the sensor or film at the back of the camera that is required to get the image in focus. The longer …
DIGITAL CAMERA SENSOR SIZES - Cambridge in Colour
Similarly, the focal length multiplier relates the focal length of a lens used on a smaller format to a 35 mm lens producing an equivalent angle of view, and is equal to the crop factor. This means …
MACRO CAMERA LENSES - Cambridge in Colour
Notes: the "focusing distance" is measured as the distance between camera sensor and subject, and the "lens focal length" is the actual lens focal length (without multipliers). True macro …
Focal length - does this change when a camera focuses?
2009年10月4日 · Given two lenses, of focal lengths f1 and f2 separated by distance d, this formula will give you the combined focal length. Lets say f1 is 200mm, f2 is 100mm, and d is …
USING WIDE ANGLE LENSES - Cambridge in Colour
A lens is generally considered to be "wide angle" when its focal length is less than around 35 mm (on a full frame; see camera lenses: focal length & aperture). This translates into an angle of …
A Flexible Depth of Field Calculator - Cambridge in Colour
Lens focal length. This refers to the actual focal length in mm listed for your lens, NOT the "35 mm equivalent focal length" sometimes used. Most compact digital cameras have a zoom lens that …