Rob this was the Edinburgh Fringe festival. Nikon d600 camera and a Nikon 70- 200 f/2.8 lens. I like the differential focus but it is difficult to achieve a good shallow depth of field effect. Not from a technical point of view but aesthetically. The lens is about £1.600 and a worthwhile lens.
What did you do with your D700?
My 2.8/180 does quite nice wide opens, but I always wanted a 2.8/300 and only got myself a 4.5/300 IFED, which was crisp enough, but not wide-apertured enough. Really, I shouldn't have bought it, but in those days I had to buy in Britain for VAT reasons and during trips back to see clients; unfortunately, nobody had the faster lens in stock during the visit when I thought I needed the focal length... That's what one gets for impulse buying: expensive boo boos.
Rob C