Vario-Tessar vs. Vario-Sonnar ? which one is better? It is not a matter of one being better. They are just different. Vario-Tessar makes for smaller lenses (because of smaller zoom ratios and lower speed, like f/3.5). Vario-Sonnar is bigger and enables higher zoom ratios -like 6x, 12x and beyond- at higher speeds - like f/2.0. Resulting image quality of either zoom lens version is on the same high Carl Zeiss level.