67mm 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: KF01.976

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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. 
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No, the cross pattern comes from the two pieces of glass needed on the variable filters. This is a single piece of glass but dependant on the focal length on of your lens, you might see some vignette, but that can be sorted on post. 
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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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you said (Tamron 77 wide angle lense?) the lens info can't be right! do you have the full name of the lens. 
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Yes it is the same size. This means you can also fit your lens cap on whilst filter is in place. However once the ND1000 is in place you cant see through it to adjust the CPL. You would need to fit the CPL, adjust image to suit and then fit ND1000. Also bear in mind CPL's often loose a stop of light so you could end up with an 11-stop filter (ND2000 equivalent if they ever made one).