What is this weird filter holder in front of Kubrick's camera?

[Alan Kovarik]

Behind the scenes image from Eyes Wide Shut.
 

[Phil Rhodes]

Split diopter. Notice the slight curve evident on the glass itself.

[Raymond Zrike]

Does anyone remember a split diopter shot in Eyes Wide Shut? I don’t remember a split diopter shot in any of Kubrick’s movies, but maybe it was just cleverly hidden (or maybe I just have a bad memory).

[Karim D. Ghantous]

2 hours ago, Raymond Zrike said:

Does anyone remember a split diopter shot in Eyes Wide Shut? I don’t remember a split diopter shot in any of Kubrick’s movies, but maybe it was just cleverly hidden (or maybe I just have a bad memory).

Nope. It looks like he's outside. So that could help narrow down which scenes to look out for.

[David Mullen ASC]

I could be the NY backlot street set outdoors but before the sun went down for a night shoot.

Kubrick shot a lot of coverage so that shot might have not made it into the final cut.

[Stephen Perera]

for those that do not know.....

Kubrick was a photojournalist before he was a filmmaker. At age 17 started shooting for Look magazine in New York where he shot everyday life and celebrity portraits....he shot with a 'film noir aesthetic" that was new to photojournalism at the time (source: Vanity Fair)