Equivalent focal length
A distance in a lens between the front nodal point and the focal plane when the lens is set to focus a subject at infinity. In a telephoto lens the equivalent focal length is shorter than the back focus.
Equivalent Focal Length - The focal length of a given lens expressed in terms of the field of view that length would give in a 35mm camera. This allows lenses for different camera designs to be expressed in terms of their real-world field of view.
Equivalent focal length. A digital camera's focal length translated into the corresponding values for a 35mm film camera. For example, a 5.8 - 17.4mm lens on a digital camera might provide the same view as a 38 - 114mm zoom with a film camera.
35mm equivalent focal length noun
a way to describe the focal length of a camera by stating the focal length of a 35mm camera that produces the same field of view ...
35mm Equivalent Focal Length
Focal lengths of digital cameras with a sensor smaller than the surface of a 35mm film can be converted to their 35mm equivalent using the focal length multiplier.
Optical Zoom (X times zoom) and Digital Zoom ...
35mm Equivalent Focal Length
The size of the image sensor varies from model to model even from the same manufacturer. So if you see a figure like 7.
35 mm equivalent focal length
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Angle of View comparison photographs
Angle of View on digital SLR cameras with reduced sensor size
Focal Length and Angle of View ...
The same equivalent focal length was used for each camera. I shot with the sharpest lens for each camera: The Nikon AF MICRO-NIKKOR 55mm f/2.8 for DX cameras, the Nikon AF-S NIKKOR 85mm f/1.
The 35mm equivalent focal length of a lens is sometimes given for cameras using other film formats,
35mm equivalent
Optical glass must be bubble-free and must have a constant refractive index and constant chromatic d ...
The 18mm equivalent focal length after attaching the LW46 conversion lens provides left to right edge to edge angle of 90 degree. 1) If you stand at one corner of the room, you can photograph everything in that room 2) On the street, ...
EFL stands for Equivalent Focal Length. Due to the smaller size of most digital camera image sensors, there is a magnification factor when using a 35mm film lens.
Well, it's a function of the equivalent focal length. The more you zoom in, the more magnified the shaking of your hand becomes, and the faster you have to shoot.
RELATIVE APERTURE-The relative aperture is the ratio of equivalent focal length to the diameter of the effective aperture. The symbol for relative aperture written as a fraction is f/ followed by a numerical value.
As the article indicates, if you use a given lens on a smaller format, depth of field is reduced and the angular coverage ("effective 35mm equivalent focal length) decreases.
With an equivalent focal length of 480mm (300mm * 1.6), a shutter speed of 1/500s or faster is required for handheld shooting. You can only get these speeds in bright daylight.
35 mm Equivalent Focal Length
Be warned that both of these terms can be somewhat misleading. The lens focal length does not change just because a lens is used on a different sized sensor - just its angle of view.
Wide-Angle Macro: Here I used the Pentax WG-2, and took advantage of its 28mm (equivalent focal length on a 35mm camera) lens set at “1cm Macro.
Don't go too wide unless you know what you're doing; a 28mm-equivalent focal length (18mm on your digital SLR's kit lens) is more than wide enough for most of the time.
For example, you may notice that equivalent focal lengths for digital cameras and film cameras are noted using different numbers.
Cameras with sensors that are less than full-frame have focal length multipliers which calculate the equivalent focal length of a lens, as it would when used with a 35mm sensor. For example, a camera with a focal length multiplier of 1.
a ratio of the equivalent focal length of a lens to the diameter of its entrance pupil. This indication is called "f" number, express in the ways like f/8 F8 1:8.
Because of the relative novelty of consumer digital imaging technology, Canon has begun providing the equivalent focal length in traditional 35mm film cameras.
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The rule of thumb to avoiding camera shake while hand holding your camera is to use the reciprocal of the 35mm equivalent focal length in use. Say you zoom to 125mm (35mm equiv.), then use a shutter speed of 1/125 sec.
A third important difference is that telephoto lenses have a smaller image circle than the standard long lens with an equivalent focal length. This limits the range of available camera movements.
The Panasonic 8mm fisheye is a fixed focal length lens, where the Tokina is a zoom lens. When compared to the Tokina at 10mm, they both have the same 180 degree angle of view diagonally, and the same 35mm equivalent focal length.
If you need to know what lens you'd need for an equivalent field of view on your sub 35mm size sensor camera just divide the focal 35mm equivalent focal length necessary for that field of view by your camera's crop factor.
Reflex Lens A reflex lens employs a combination of mirrors and lens elements to "fold" the light path, permitting a reduction in overall lens length and weight compared with conventional lenses of equivalent focal lengths.
Because of the confusion this causes, most digital camera companies give the actual focal length of their lenses and then an equivalent focal length were the lenses to be adapted to a 35mm camera. For example, a camera's lens may be described as 8.
It's also harder to design and build a fast zoom lens than it is a fast prime (fixed focal length) lens. Faster lenses are also usually physically larger than slower lenses of equivalent focal lengths.
With a 50mm lens, a shutter speed of at least 1/50sec should be used. A 300mm lens will need a faster shutter speed of 1/300sec. The 35mm equivalent focal length should be used, see page 38 for more on lenses.
sorely missing until now, and the lack of which has caused some people to be hesitant about switching to digital. Of course, at the telephoto end, this same "problem" becomes an advantage since a 400mm lens on a DSLR has an equivalent focal length of ...
 See also: Focal length, Focal, Camera, Lens, Image
  
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