Zeiss Discusses the Planar Lens Design

If you don't follow Zeiss' CLN, or Camera Lens News blog - it's worth checking out. They don't put out a lot of material, but what they do is usually a good read. This entry is one of their better ones, and they discuss the Planar lens icon (design) which as you may or may not know - is one of the most common, most copied of all lens designs. It has withstood the test of time, and indeed - going by the 2/50 Planar ZM - perfected. You can access the Planar lens icon (PDF) by Dr. Hubert Nasse directly. There will be more articles on the other designs forthcoming, and they've already done one on the Tessar (PDF).