Tagged Questions
2
votes
2answers
135 views
What is zoom multiplication based on?
When a camera says that it has, for example, a 10x optical zoom, what exactly is that 10x based on? Is it the angle of view of the human eye, the focal length of the camera, or what?
9
votes
2answers
841 views
What is the meaning of W and T on a camera's zoom buttons?
On every conventional digital camera (excluding the models with detachable lenses), there are buttons to zoom in and out with W side and T side.
When you press W, the lens zooms out. The lens zooms ...
9
votes
5answers
644 views
Why do fixed lens cameras have a motorized zoom while interchangeable lens cameras don't?
I would like to know why motorized zoom (controlled by a W/T lever) is always on fixed-lens cameras and never on interchangeable lens cameras.
8
votes
4answers
4k views
What does 'how much zoom' mean?
I have Canon 18-135 and 70-300 zoom lenses. People ask me how much zoom my camera supports.
What am I supposed to tell them?
"135 ÷ 18 = 7.5" and "300 ÷ 70 = 4.2"?
12
votes
4answers
3k views
How can a lens like a 18-55mm have more than one focal length?
How can a lens have a range of focal lengths? Shouldn't it be a single number?
Isn't focal length supposed to be fixed for a lens of a particular shape and geometry?
What am I missing?
How many ...
