77mm Variable Lens Filter ND32-ND512 No X Spot Cross-wire Ultra-thin

SKU: KF01.1474

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77mm variable ND filter you are asking, Your camera's lens thread size will be marked somewhere on the lens barrel or printed underneath your lens cap. This number is always preceded by a "Ø" (diameter) symbol. For example: Ø77 = 77mm lens thread size. hope it helps. 
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K&F Concept 55mm variable ND filter you are asking, you mentioned your Minolta 24-70mm vintage lens is 55mm, just please go ahead to purchase, please do not worry about it. as long as the lens size and the filter size is the same, then works. hope this helps. 
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no this would be tom small, check your lens for the correct filter size, either 82 or 86 mm I think By JoeP on 29 March 2021