Dear Cgeoff,
As a Nikon DSLR user, it is a god news.
Referring to Nikon web:
The FT1 mount adapter allows NIKKOR F mount lenses to be used with Nikon 1 cameras equipped with a Nikon 1 mount. The angle of view of an F mount lens mounted on the FT1 is equivalent to that of a 35mm format lens with a focal length about 2.7 x longer.
For example:
70 - 300mm lens will extend to 189 - 810mm without any influence on the aperture.
Sure the zoom range is good for photo taking for the birds.
For more detail, please visit Nikon web site.
Thank you !
FR:John