Sorry I dont get this equivalence stuff

In the post on reviews today we got the old " a 50mm becomes a 75mm on DX" along with a f1 lens is 1.4 on DX.
Not wanting interrupt the high level discussion on sensor dyes etc I just want to say I dont get it.
A 50mm lens is a 50 mm lens just putting its image on a sensor of whatever size and this f1 going to 1.4 seems the ultimate stupidity. Its just passing light through to a sensor.
Perhaps the brains of this outfit can explain without telling me that a 75 on FX has the same angle of view as a 50 on DX


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