Conversion of Zoom Rates for FX, DX and CX sensors

Nikon has three sizes of sensors for their current models of cameras with exchangeable lenses. The same lens gives different angles of view depending on which sensor it operates on. If you, for example, like using a 50mm prime lens on your D700 camera (FX sensor) and you want to use a lens with a similar width on your D5100 camera (DX sensor), you should get a 35mm lens. (You should actually get a 33mm lens, but that does not exist, and 35mm should be close enough.) More about that here.

The table below gives some common focal lengths in mm and their equivalent with other sensors.

Sensor type:	FX	DX	CX
Crop factor:	1	1.5	2.7
	28	19	10
	50	33	19
	70	47	26
	200	133	74
	270	180	100
	300	200	111

Some cameras with FX sensors are: D700, D800, D3, D4,

Some cameras with DX sensors are: D300, D7000, D5100, D3200, D40, D50, D60, D70, D80, D90

Some cameras with CX sensors are J1, V1.