----- Original Message ----- From: Tom Ivar Subject: Re: Terminology lesson. Re: 28-105 vs 24-90 vs 35-105
> And wrong. :-) > > Once upon a time, it was common to use special sets of lenses for view > cameras. You mounted a primary lens, called the prime, on the lens > board, and then fixed one of a collection of different secondary (or > auxiliary) lenses to the front of the prime lens to select the wanted > focal length. They were designed as a kit to work reasonably well > this way, and were more cost effective than a collection of complete > lenses at the resulting focal lengths -- especially because you got > away with a single shutter, in the prime lens. It's sad you had to post that twice. Hopefully, you won't get argued with. William Robb
