Bruce, Tessar and Planar were both designed by Carl Zeiss lens designer Paul Rudolph, Planar in 1896 and Tessar in 1902. Tessar is a four element three group design. Some Tessar lenses are focused by rotating the front element, better ones are focused by moving the whole lens.(posted 8729 days ago)1896 Zeiss Planar was a 6 element 4 group double Gauss type design.