So, I'm a little confused about these two adapters (and third APS-C equivalents). LAEA4 & LAEA2 allow for PDAF in Alpha lenses via the translucent mirror. But it isn't clear to me whether LAEA4 is necessary for E-mount cameras that already have PDAF on the sensor. Could I hypothetically get away with just having LAEA3 on my A7 with its PDAF on sensor (assuming I don't buy any lenses that lack a AF motor)? I cannot seem to find any information on this question anywhere...even though it seems like it should have been asked a dozen times when the PDAF first appear on NEX cameras.