Quote Originally Posted by Shaggy
Planars are generally more highly corrected for near distance, normal focal length, Sonnars are telephoto and Biogons are wide angle formulas
On MF cameras like the 'Blad and Rollei, Sonnars are long focal length lenses.

Historically, Zeiss (both West & East German) and Rollei Sonnars have covered the range from normal (50mm, Zeiss Contax) and wide normal (40mm, 38mm small Zeiss and Rollei cameras) through long focal length lenses.