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Ron Martinsen's Photography Blog: COMPARISON: Variable Neutral Density Filters (Singh-Ray, B+W, Hoya, Tiffen & Bower)
![Amazon.com : Singh-Ray 77mm Vari-ND Neutral Density Filter : Camera Lens Neutral Density Filters : Electronics Amazon.com : Singh-Ray 77mm Vari-ND Neutral Density Filter : Camera Lens Neutral Density Filters : Electronics](https://m.media-amazon.com/images/I/413zAHqfy+L._AC_UF894,1000_QL80_.jpg)
Amazon.com : Singh-Ray 77mm Vari-ND Neutral Density Filter : Camera Lens Neutral Density Filters : Electronics
![Amazon.com : Singh-Ray 77mm Vari-ND Neutral Density Filter : Camera Lens Neutral Density Filters : Electronics Amazon.com : Singh-Ray 77mm Vari-ND Neutral Density Filter : Camera Lens Neutral Density Filters : Electronics](https://m.media-amazon.com/images/I/413zAHqfy+L.jpg)
Amazon.com : Singh-Ray 77mm Vari-ND Neutral Density Filter : Camera Lens Neutral Density Filters : Electronics
![Ron Martinsen's Photography Blog: COMPARISON: Variable Neutral Density Filters (Singh-Ray, B+W, Hoya, Tiffen & Bower) Ron Martinsen's Photography Blog: COMPARISON: Variable Neutral Density Filters (Singh-Ray, B+W, Hoya, Tiffen & Bower)](http://www.singh-ray.com/wp-content/uploads/2014/05/vari-nd-filter1.jpg)