37mm ND1000 (10 Stop) Filter Nano-X Series - Multi-Coated Optical Glass, Fixed Neutral Density Lens Filter

SKU: KF01.997

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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, I bought this filter (82mm) specifically for my Sony 24-70mm G-master. Naturally, not all Sony lenses have this diameter filter thread. 
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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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Filter size is filter size. Internal thread measurement for any focal length as long as the outside filter diameter is 58mm. 
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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). 
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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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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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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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The lens hood can be used as normal without changing the thread. Simply screw the filter on and then the Geli afterwards