Hi Matt
The most obvious physical difference is the chip size and pixel size. Comparing each monochrome camera I get the following from the Adirondack website:
Lumenera - SKYnyx2-0 Monochrome CCD Astrophotography Camera
Resolution 640 x 480
Sensor Type 1/3" CCD
Bit Depth 8 or 12
Monochrome
Dark Current <1 e-/s
FPS 60
Lens Mount T
Pixel Array 7.4 um
Readout Noise 10 e-
Well Depth 40,000 e-
Lumenera - SKYnyx2-1 Monochrome CCD Astrophotography Camera.
Resolution 1392 x 1040
Sensor Type Sony 1/2" CCD
Bit Depth 8 or 12
Monochrome
Dynamic Range >66dB
Lens Mount T-Mount
Pixel Array 4.65 um
Readout Noise 12 e-
Lumenera - SKYnyx2-2 Monochrome CCD Astrophotography Camera
Resolution 1616 x1232
Sensor Type 1/1.8" CCD
Bit Depth 8 or 12
Monochrome
Dark Current <2 e-/s
FPS 12
Lens Mount T
Pixel Array 4.4 um
Readout Noise 12 e-
Well Depth 14,000 e-
Feeling rich are we??
Cheers
Dennis