W/NW Sonnar Lenses

Re design, see http://taunusreiter.de/Cameras/Biotar_en.html, scroll down a little for the Sonnar family.

The "essentials" seem to be a large front element followed by a cemented triplet and then the aperture. Smaller elements behind the aperture. Longer focal lengths have a cemented doublet in place of the triplet.

Modern Sonnars (from the Rollei 40mm/2.8 on) tend to use three elements up front with the central part of the cemented triplet "left out." They are Sonnars in that they otherwise follow the design rules and on a lens diagram it can be difficult to see whether a cemented triplet or "air lens" has been used. c.f. http://www.rangefinderforum.com/forums/showpost.php?p=321880&postcount=12 and compare to the link above.
 
From 50mm f1.4 Nikkor-sc in ltm

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