Originally posted by bdery To be fair, a lot of people use the term "zoom" to refer to a tele lens. Without being anal, I try to use the correct term, and often get "deer-in-headlights" look from people.
Just like people who call the thing under the hood of their car a "motor".
It isn't a motor, it is an engine.
Big difference.
A motor uses energy from an outside source, i.e. electricity, air, water or hydraulic fluid under pressure to produce motion and do work.
An engine converts a fuel, i.e. gasoline, diesel, propane, etc. into heat, and converts that into motion to do work.
A motor is nothing without an engine, as the engine can turn a pump or generator to operate a motor, but the engine doesn't need a motor to do work.