What type of mount is this?

[Alexis Hanawalt]

Looks exactly like a PL but has a pin instead of a notch... obviously won't be accepted by a PL mechanism... but is it a different kind of mount? This thing was put on a Nikon lens, that's all I know about it.

 

[Matt Uhry]

looks quite like a Panavision mount - see if it's 49.5mm diameter at the back.
Matt Uhry

 

[Jacek Zakowicz]

Matt is right,
This is Panavision mount it should not be hard to convert to PL...

 

[Alexis Hanawalt]

Jacek! You owe me a call about my Cooke 20-100...!

Can you do a conversion to PL? What does that cost?

Best,
Alex

 

[Jacek Zakowicz]

Email sent- I'm pretty sure I can convert it.

 

[Björn Benckert]

Looks like BNC-R or? also possible to change to PL for about 500USD-600USD + shipping... if it's a BNC-R then the flange distance is + 9.746mm so in other words you should then be able to hold it infront of a pl mount and get quite clear picture... if it is a BNC-R not sure though.