Maximilian said:Fastest ever lens was the Zeiss Super-Q-Gigantar 40mm f/0.33:
http://petapixel.com/2013/08/06/carl-zeiss-super-q-gigantar-40mm-f0-33-the-fastest-lens-ever-made/
But that was just a marketing gag.
So regularely Zeiss made sone with f/0.7, also mentioned in the article above.
Enjoy reading.
From the article: "...and photographers became fixated on the speed of lenses on paper rather than their performance in real world situations."
Amazing how different photographers were back then...
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