Comment on Zeiss f/0.7: You Can Now Rent Two of the Largest Aperture Lenses Ever MadeComments−cuu50813yA list of fast lenses on wikipedia: http://en.wikipedia.org/wiki/Lens_speed#Fast_lenses There are several lenses around 0.7, and some with even lower f-numbers.−nknighthb13yThey don't appear to be commercially available, and some of them seem rather special-purpose.−jychang13yMost are for XRay imaging.−ams611013yThey don't necessarily do a terrible job at optical imaging though. http://forum.mflenses.com/viewtopic.php?t=50166−RyJones13yAnd one of them is a hoax.
Comments
A list of fast lenses on wikipedia: http://en.wikipedia.org/wiki/Lens_speed#Fast_lenses There are several lenses around 0.7, and some with even lower f-numbers.
They don't appear to be commercially available, and some of them seem rather special-purpose.
Most are for XRay imaging.
They don't necessarily do a terrible job at optical imaging though. http://forum.mflenses.com/viewtopic.php?t=50166
And one of them is a hoax.