Boys and girls. Valentine’s day is on a Saturday this year. Today is the 7th and it’s exactly one week away. Are you going to be ready? Made your reservations yet? If your significant other is an avid photographer, we’d like to lend you a hand with the gift. Here are 10 gift ideas for photographers. Most are available on Amazon Prime so you know they’ll arrive on time.
The German optical systems manufacturer, Carl Zeiss, has had a 168 year legacy in creating some of the world’s best lenses. In 2011, H.H. Nasse wrote a series of technical papers for Carl Zeiss detailing their modern lens history and genealogy. In his three part series, he discussed 5 lens designed that changed the world. They are the Planar, the Tessar, the Biogon, the Distagon, and the Hologon (click on these links to download the original PDF files).
While very detailed and technical, it is a difficult read for your average Joe. That’s why, we have repackaged the information in a more reader friendly format and filled in some holes with our cited research (such as adding the missing Sonnar lens). That being said, I still recommend you read Nasse’s original papers after you read this article. They are filled with interesting tidbits about optics and engineering.
Zeiss Normal and Telephoto Designs
A normal/standard lens means its focal length is about the diagonal length of the image capturing area. For 35mm film and Full Frame cameras, that translates to 24x36mm with a diagonal of 43.3mm. This means, lenses with focal lengths near 43.3mm can be considered normal lenses. We usually consider lenses between 35mm – 60mm as normal lenses.
This legendary Zeiss design trademarked Planar (also known as Biotar or Biometar in E. Germany’s Carl Zeiss Jena) is derived from, and suggests, a “plane/flat” field curvature. Most of the world’s fastest lenses today are derivatives of the Planar design, including: