It is c mount 1.4 75mm, the same one that somebloke used in his scopeless, can be used in spotter too. These usually go for a lot of money. $250-$400.
I'm selling the one on the left with scuff mark on the lip, glass is clear and all good.
Want to offer them here first before I put it on ebay.
£65 posted, PayPal is ok




















