Used the 1:7 converter with these, but feel it comes out a little soft - is a heavy crop - but liked the colours
Nikon D3 w/1:7 converter
2007/12/08 08:53:07
Lens: 500mm F/4 D
Focal Length: 850mm
Exposure Mode: Aperture Priority
Metering Mode: Spot
1/250 sec - F/9
Exposure Comp.: -0.3 EV
Sensitivity: ISO 400
Optimize Image:
White Balance: Color Temp. (5260 K)
AF Mode: AF-S
Flash Sync Mode: Not Attached