f/0.75

Photographer Finds Massive De Oude Delft 105mm f/0.75 Lens, Manages to Use it with His D610

There are perks to doing your PhD on optical studies of the aurora, and among them is that you might just stumble across a very exotic lens like the De Oude Delft 105mm f/0.75 in the cabinets of the research group you're working with.

That's what happen to photographer Jason Ahrns, and although they wouldn't let him buy the lens, he was allowed to take it home on an extended loan and try to put this monster through its paces.