|
Lens
> Zoom lenses
|
While you probably already grasp the
concept, play this simple zoom to
make sure we are all on the same page.
|
|
|
Almost
every video lens is a zoom lens. (Long ago "zoom"
was a brand name, but over time it became a generic
term. It's the same fate that "cellophane"
and "kerosene" suffered. "Kleenex"
and "Jello" aren't far away. And the Coca-Cola
corporation has lawyers dedicated to making sure "Coke"
doesn't slide into generic use. Because once it does,
anyone could call their soft drink "Coke." Not good
for Coca Cola stock.)
"Zoom"
simply means that the lens can magnify the image a lot
or a little--and can glide between those settings.
By
contrast, a "fixed" lens cannot glide between
different magnifications. Things that have a fixed lens:
binoculars, disposable still cameras, your eyes.
|