77mm Variable ND Filters ND2-32 Adjustable Fader Neutral Density ND2 - ND32 Filter, NO Spot X Black X Issue, MRC 28-Layer, Ultra Slim, Waterproof

SKU: KF01.1063

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52mm filter. If your lens takes a 52mm then I'd think so 
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It will surely effect the whole image. Filters are generally not for portrait photography. Move the person. Adjust your shutter and aperture settings. Edit the background with PS or LR 
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I don't think you can attach another filter to this. The outside is a bigger diameter. 
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This is a filter to fit a 67mm lens as it says on the box. 
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67mm ND2~32 variable ND filter from K&F Concept you are asking, Front thread diameter (attach additional filter/other accessories) is 72mm, so if you need to attach lens cap, the size is 72mm, hope this helps. We care about our customers, any questions, you can ask us directly at gearfocus@kentfaith.com. All emails would be replied in 24 hours, no exception see less 
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It should do, just check the OD of your lens it will have the thread size marked on it. 
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The size you require is usually stamped on the inside of the lens cap. 
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sure, 2 years warranty, any questions, pls just feel free to contact seller via gearfocus@kentfaith.com, please be assured that we always stand behind our products. 
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One size up, e.g. if you are already using a 55mm filter, you will need to use a 58mm filter if you need to overlay a filter