Sony 55mm 1.8 E Mount
Related Faq
Q
Does this fit on a 50 mm 1.8 or should i go for the next size?
A
Check your lens thread size which is beside a "ø" (diameter) symbol. Order this filter of the same size. 
Q
Suitbale for sony 28-70mm lens on an a7iv (55mm is marked on it). can i also use a lens hood?
A
Yes, can and I do. 
Q
Would this mount onto my old Minolta 24-70mm vintage lens (55mm)? I'm just but a bit cautious since old lenses aren't mentioned in the description.
A
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. 
Q
Will this connect a sony a mount sal75300 lens to a sony a 6000 e mount body?
A
Yes you can 
Q
Why doesn't it have a 55mm ring?
A
I think they went with common adapter sizes based on popular lens types, you can get a set of step up/down rings that can be adapted to your 55mm filter diameter. I think they sell for like $15 or something like that. You're going to want to get a 55mm step up to 58 mm ring 
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