With all 617 camera, do you have to buy a new lens mount with every new lens you buy? i was looking at the gaoersi one and it looks like i have to add $400 everytime to the cost of the lens for a new lens mount obviously for different sizes, is this just the case with the gaoersi? do other 617 have adjustable lens mounts so you can mount anything from a 90mm - 210 etc etc with out changing lens mounts?
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