A:AnswerHi JamesMom, this lens will work with the A6000 as well as your A7M3 since it was designed for full-frame. Please note that the angle of view when the lens is installed on the a6000 with be multiply by 1.5x so the 50mm lens will become 75mm lens. The f-stop (f/1.4) on the lens will greatly help shooting in low to dim lighting condition.
A:AnswerHi, Sony's commitment to customer satisfaction is our top priority. The lens is fully compatible with the A7RM4 camera. Thank you so much for your question. And thank you for choosing Sony.