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The lens of a digital camera has a certain focal length, expressed in mm. For example, a 50mm lens has a field of view that approximates what we see with our eyes looking straight ahead. A 25mm wide-angle lens has a field of view that approximates what we see with our eyes when we turn our head from side to side.
The shorter the focal length of a lens, the wider the field of view. The longer the focal length of a lens, e.g. 300mm, the narrower the field of view. Of course, a narrow field of view is equivalent to zooming in to a far object, like when we look into binoculars.
A lens can either have a fixed focal length, e.g. 25mm, 50mm, 300mm, etc. or can have a range of focal lengths, e.g. 25mm - 100mm, 50mm - 300mm, etc.
A lens that has a range of focal lengths is called a zoom lens. The zoom factor of the lens is calculated by dividing the maximum focal length by the minimum focal length. That zoom factor is the "X" you are referring to.
For example:
1. A 25mm - 100mm lens is a 100/25 = 4x zoom lens.
2. A 50mm - 300mm lens is a 300/50 = 6x zoom lens.
3. A 50mm - 200mm lens is also a 200/50 = 4x zoom lens.
4. A 100mm - 400mm lens is also a 400/100 = 4x zoom lens.
So knowing the zoom factor of a lens alone does not tell you what its minimum and maximum focal lengths are. Both examples 1, 3 and 4 above are 4x zoom lenses, but example 1 has a minimum focal length that is a wide-angle and allows us to take wide landscape shots or include all our classmates in one shot. Example 4 has a maximum focal length that is a long telephoto and allows us to bring far object near.
What else can I help you with?
How does a camera zoom in and out?
On a digital camera, there is usually a knob on the top of the camera. On Panasonic cameras the zoom knob is around the shutter button. Left zooms out and right zooms in.
What type of digital camera is better either with optical zoom or digital zoom?
Optical zoom is way better than digital zoom as digital only expands the picture. Optical zoom actually zooms in.
What is a zoomer?
A zoomer is something which zooms, such as a camera.
Which button zooms in a camera?
That button is different on each camera. Sometimes it's not a button.
Camera zoom lens was invented in..?
digital cameras --------------------------------------- Zooms have been around a Lot longer than digital cameras, but it wasn't until the mid '70's that computers were used to help design them, making them more affordable and efficient (smaller)
What camera is more popular a digital camera or a old camera?
Digital Camera!
How does one replace a canon digital camera battery?
A Canon digital camera battery can be replaced by buying a Canon digital camera battery and putting the Canon digital camera battery in the Canon digital camera battery socket of the Canon digital camera.
Where was the digital camera developed?
at the digital camera factory!
What was the first Sony Digital SLR camera?
The first Sony Digital SLR camera was made with the new X+30 series. This camera integrated new technology that allowed for quick photography like never before.
What does 18-55 mean on a dls camera?
the lens zooms from 18 toi 55 milimetres.
Is a digital camera a hardware or software?
A digital camera is hardware.
Is digital camera a noun or a verb?
"Digital camera" is two words. "Camera" is a noun and "digital" is an adjective describing the camera. Neither word is a verb.
