Optical zoom
A lens that can be adjusted from one focal length to another. Wide zooms cover a range of wide-angle focal lengths while tele zooms cover telephoto ranges and superzooms go from wide angle to a long telephoto.
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Optical zoom
Zoom lenses on digicams work much like the ones on camcorders. There are two buttons. One lets you zoom in, increasing the focal length and narrowing the angle of view, while the other lets you zoom out, widening the angle of view.
Optical zoom
Techniques Glossary Optical zoom
A lens that can be adjusted from one focal length to another.
Why Optical Zoom Matters for Digital Camcorders
By: Dachary Carey
Most digital camcorders come with a range of features to try to wow consumers. One of the most popular features is optical zoom.
Optical zoom is a method of narrowing the angle of view by changes in the arrangement of lens elements.
With optical zoom lens you can actually "move" closer to the subject of the photograph without losing quality. Using the optical zoom feature you can take the photograph of a distant subject and still get a clear, close-up image.
Optical Zoom (X times zoom) and Digital Zoom
Optical zoom = maximum focal lenght / minimum focal length
For instance, the optical zoom of a 28-280mm zoom lens is 280mm/28mm or 10X.
Optical Zoom vs. Resolution
What about optical zoom vs. resolution? Sigh! Now y'all know that we cannot and should not be comparing apples ‘n oranges, but we still try.
Optical Zoom
Optical zoom is a camera feature where the lens system physically changes focal length to zoom in on distant subjects
Opaque ...
OPTICAL ZOOM - A true zoom effect unlike a digital camera's digital zoom.
OPTICS - The branch of physical science that deals with the properties and phenomena of both visible and invisible light and with vision.
Optical Zoom
Optical zoom is produced by the lens system and can be adjusted from the minimum and maximum focal length according to the condition we need.
Optical Zoom
The focal length of the lens extends and retracts so an image is magnified by the lens itself. Whatever the focal length of the lens, image resolution stays the same. Optical zooms produce the best photo quality (see digital zoom).
Optical Zoom
An optically formulated imaging device with continually variable focal lengths. Allows users to vary subject magnification without changing position, as with the telephoto zooms used on interchangeable lens film cameras.
optical zoom
An optical zoom brings the subject closer before recording the image on a digital sensor or film. In contrast, a digital zoom manipulates the image after it has been taken using software.
Optical Zoom: Optical zoom lenses on a digital camera use all of the CCD image sensor's area to capture the image. Digital zoom essentially crops the image to deliver an apparent increased zoom effect but the trade-off is image quality.
OPTICAL ZOOM- A zoom lens that achieves its magnification by moving parts of its lens forward or backwards. This usually takes place inside the camera, out of view, but can often be heard as the sound of a small motor and other mechanical parts.
Optical Zoom - Optical zoom lenses can be adjusted to magnify an image (zoom in) or to capture a wide-angle shot (zoom out). Optical uses the full capability of the CCD, so it is superior to digital zoom.
Optical zoom - A feature that alters a camera's focal length, filling more of the frame with the subject.
Optical Zoom
Indicates that the camera has a real multi-focal length lens, as opposed to a digital zoom, which magnifies the center portion of the picture.
Orientation Sensor ...
Optical Zoom: Uses the lens of the camera to bring the subject into closer view. When compared to digital zoom, optical zoom is far superior since you do not lose image quality like you do with digital zoom. 3x-5x optical zoom is standard.
Optical zoom. Magnification produced by the elements of a digital camera's lens, as opposed to digital zoom, which merely magnifies the captured pixels to simulate additional magnification.
Optical zoom
Zoom lens.
Overexposure
When a shot receives too much light so that the photo is too bright and colours are bleached out.
Underexposure.
Optical Zoom
An optical zoom is made to bring you closer to your subject, without you having to move. Zooms are constructed to allow a continuously variable focal length, without disturbing focus.
Optical Zoom
Optical zoom is a higher grade zoom lens found on a digital camera. It refers to the camera's real multi-focal length lens. Optical zoom lenses physically extend in order to magnify the subject.
Optical zoom measures the ability of the camera's lens and other parts to capture more light, and more detail, from a particular faraway point.
Optical Zoom, Digital Zoom, and equivalent focal lengths
Aperture
Image stabilization ...
Optical zoom captures more details of the images that are received by the camera sensor.
Pin Cushioning
This is the term for the squeezing of a picture toward the center of the frame that occurs during barrel distortion.
optical zoom vs digital zoom
There is one feature in the average pocket camera that you should avoid the usage of: the digital zoom. Why? Here is the explanation: ...
Optical zoom is how far your camera's lens can physically extend from the camera body (its focal length).
Optical zooms use a combination of lenses to magnify the image prior to being captured by the sensor (or film).
Digital zooms change the presentation of existing image collected by the sensor, augmenting it via interpolation at the cost of quality.
Optical zoom - good!
Digital zoom - not so good.Better than no zoom at all but not much.
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Optical zoom is probably the most popular lens feature on consumer cameras. Normally the zoom range is restricted to around 3:1. On the cheaper cameras, there is a trade-off in maximum aperture at longer focal lengths, e.g.
Optical Zoom
Means the camera has a genuine zoom lens, not just a "digital zoom" which the writer considers a bit of a gimmick.
ORF ...
An optical zoom physically changes how far the lens is from the sensor. Digital zoom, on the other hand, simply forces the camera to create the picture from one portion of the sensor rather than the whole thing.
The optical zoom lens are amazing. These 4x lens will have you feeling like a professional. You can zoom in on distant objects the perfect match for travel, outdoor and sports pictures.
While an optical zoom lens magnifies the image, a digital zoom lens crops the image after the maximum zoom is reached. Essentially a digital zoom enlarges and crops the image seen in the viewfinder instead of magnifying the subject.
Unlike an optical zoom, the digital zoom takes the central portion of the high resolution sensor's image to achieve the effect of a zoom.
An optical zoom is a great feature. We see no benefit to digital zoom ("DZ") whatsoever. DZ is just stretching a portion of an image captured by the camera's glass (or optical) lens.
Comparison of optical zoom and digital zoom
Note however that if you are saving small images (e.g. 640x480), digital zoom can be useful. Some cameras take a crop from the full size (e.g. 2272x1704) captured by the camera and resize it to 640x480.
Comparison of optical zoom and digital zoom
JPEG, TIFF and RAW
The size of the digital file corresponding to the image which the camera produces depends on the pixel count.
The slimmest 12x optical zoom in its class
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0 Megapixel, no optical zoom and just 2 x digizoom.
The quality was pretty poor and never 'loved' to use it.
Then I got this extreme offer for a Samsung i70 Slidecamera a short while back.
7.
Optical zoom is performed by the lens and actually changes the amount of the scene falling on the image sensor. Every pixel in the image contains unique data so the final photo is sharp and clear.
These are the optical zoom and digital zoom. The optical zoom works by changing or adjusting the focal length of the lens to magnify the subject.
Digital zoom cameras have built-in lenses such as 10X optical zoom and digital zoom. 2X and 3X are the most common optical zooms. A 3X means three times from the widest to longest setting, for example, 35mm to 105mm.
When taking portraits, get as close as you can, physically or with your camera's optical zoom lens. To avoid red-eye, have your subject look directly at the nearest light source right before they look at the camera.
Digital Zoom versus Optical Zoom
As compact digital cameras started to become popular several years back, one of the ways manufacturers attempted to differentiate their products was by extending the zoom range.
You'll definitely want a camera with decent optical zoom. Now the keyword here is optical zoom (as opposed to digital zoom). Optical zoom physically moves the camera lenses to zoom in on a subject.
An optical zoom actually allows you to change the "field-of-view" of the image, so that you can widen out for a landscape shot, or zoom in for a portrait. It does this by moving lens elements to change the focal length of the camera's lens.
It has 5 megapixels, 8x optical zoom and manual settings for just about everything that you can think of. There's a built-in speaker as well...which makes it really handy to play back your short movies.
Zooming is another important consideration with digital cameras - there are two kinds of zoom: optical zoom and digital zoom.
0x optical zoom genuine Canon lens provides greater power and flexibility, and combines with Canon's Intelligent Image Stabilizer (IS) system to deliver crisp, clear images in stills and movies.
A digital zoom crops an image at what the approximate optical zoom would magnify to, and then discards the outlying information.
The optical zoom lens zooms within the camera’s casing, while the camera is controlled via a generous 3-inch, touch-sensitive, wide aspect ratio LCD monitor—a feature that’s sure to get an “oh, ...
Now I recommend looking at the different optical zoom capabilities available. The average zoom is 3X with some small cameras offering up to 5X and larger cameras offering up to 12X. Is more zoom better? To a certain degree, yes.
This is commonly known as digital zoom and results in a lower quality image than optical zoom, as no optical resolution is gained.
Rather different from Optical Zoom. With Digital Zoom the image is magnified by spacing out the pixels electronically, and as such is really very little different from blowing an image up to a larger size using a software package on your PC.
0x optical zoom and an ISO sensitivity of up to 1600. It is capable of taking both photos and full HD video in 2D or 3D. Here's the kicker, the display actually shows you the resulting image or video in lenticular 3D, no glasses needed! ...
The Canon PowerShot A720 IS is a perfect example of this; 6x optical zoom, 8 megapixel sensor in a nice little compact case for $229. Memory cards cost more than this a year or two ago.
Make sure the camera has the right features for your needs, such as an optical zoom lens and a certain amount of useful manual controls.
 See also: Zoom, Camera, Digital, Image, Lens
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