K&F Concept 49mm Variable ND Filter ND8-ND128 (3-7 Stop) HD Hydrophobic VND Filter for Camera Lens No X Cross Nano-Xcel

SKU: KF01.1447

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yes, on both sides of the filter 
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yes, on both sides of the filter 
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For the Nikon 7200 you need a filter in the size 67 mm, this also applies to all lenses. 
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For the Nikon 7200 you need a filter in the size 67 mm, this also applies to all lenses. 
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It's better to buy a cleaning fluid for lens filter. 
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It's better to buy a cleaning fluid for lens filter. 
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Dear Customer, it could fit your Sigma f2.8 24-70mm lens with 82mm threads. 
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All the filter could satisfy your need for the outdoor music videos in bright sunlight. but the nd 2-32 and 8-128 could be much better. if you like it a little bit darker, then nd 8-128 will be your choice. If you have no concern on nd stops, then nd 2-32 could be your choice. 
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Yes, it has threads on both sides but they do not have the same diameter. For example, if the filter is 77mm, the outer part is 82mm.