46mm 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: KF01.1000

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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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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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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.