An Introduction to the World of Lenses

It’s an upside down world when it comes to lenses when bigger openings sometimes means a smaller opening and, literally, up is down and down is up. In that light it’s no wonder that lenses can be confusing so let’s see if we can untangle some of the mysteries of the glass in front of your camera sensor. The topic is important because while camera bodies will be with you for a few years, good lenses will be around most of your life. That’s quite a commitment!

           Chris Poindexter

The Ins and Outs of Autofocus

I remember when the first autofocus cameras came out, it was a topic of some ridicule and professional snobbery in the early days. Some of the real early systems were based on IR or sound which could be fooled by rain or anything moving in the field of view. All of the early autofocus systems were slow. Push the button, then watch as the focus system started hunting around, eventually settling on something that seemed about right. In the late 70s and 80s came the lenses with in-lens focusing motors so big they left an obvious lump in the lens contour. We called those “goiter” lenses.

           Chris Poindexter