Nikon 1 (V1 & V3)
The Nikon 1 V1 and V3 are 10&18 mpx lightweight cameras with a crop factor of 2.7. Nikon produces an FT1 adaptor which allows Nikon afs lenses to be used with this camera. This means that the camera can be used with lighter weight lenses yet give more reach without affecting aperture. Also it is light enough to carry to nearly double reach without aperture loss.
For example
70-200mm f2.8 == 540mm FOV
300mm f2.8 == 810mm FOV
500mm F4 == 1350mm FOV
all without aperture loss and vibration reduction.
Since July 2014 Nikon's CX 70-300mm VR lens has made the N1 series perfect for birdwatching.
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