77mm ND1000 Filter 10 Stops ND, Solid Neutral Density Lens Filter Multi-Coated Optical Glass Neutral Grey ND with Multi-Resistant Coating Nano-Xcel series

SKU: KF01.977

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Please dont !!! . ND of 10 stops is nowhere near enough for sun photos. You risk damage to your eyes whilst setting up shot also your camera sensor wont appreciate it. 
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This will fit any make of lens with this size thread 
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Hey, this filter should fit any lens that has the appropriate filter thread (In this example, 37mm should fit any 37mm filter thread). If for some reason it doesn't fit, you can always return it and go from there. But I would be very surprised if it does not fit. 
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Hello, all of our filters have the same top and bottom thread size. This means that the filters can be stacked on top of each other, and the lens cap and lens hood can be attached. Kind regards 
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The lens hood can be used as normal without changing the thread. Simply screw the filter on and then the Geli afterwards 
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No I don't think it will fit any Gopro not unless it's specifically made for it. This size fits a 58mm lens thread and the Gopro has a much smaller size lens. 
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Yes, there are threads on both sides (I just tried), which can be useful for adding a polarizer. However, you can just as easily have the K&F ND1000 filter stacked onto the inner filter. 
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Yes you can, I just tested this by screwing on a 82mm polarizer filter. But keep in mind: 1) This can easily cause vignetting with wide angle lenses; 2) colour shifts because of camera sensor reciprocity failure as well as any colour casts inherent to the second filter. 3) Slight resolution and contrast losses. 
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Canon has at least 7 different 50mm lenses. You need to look on your lens to see what filter size it takes. It'll be written on the lens at the front, beside this symbol: Ø.