![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://static.bhphoto.com/images/images500x500/1014988.jpg)
Ron Martinsen's Photography Blog: COMPARISON: Variable Neutral Density Filters (Singh-Ray, B+W, Hoya, Tiffen & Bower)
![Amazon.com : Hoya 77mm Variable Density Screw-in Filter : Camera Lens Neutral Density Filters : Electronics Amazon.com : Hoya 77mm Variable Density Screw-in Filter : Camera Lens Neutral Density Filters : Electronics](https://m.media-amazon.com/images/I/71Ya7SVDYcL._AC_SS450_.jpg)
Amazon.com : Hoya 77mm Variable Density Screw-in 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)
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) Ron Martinsen's Photography Blog: COMPARISON: Variable Neutral Density Filters (Singh-Ray, B+W, Hoya, Tiffen & Bower)](http://ronmart.smugmug.com/Blog/Reviews/RediPix-Print-9-Edit/859748861_jJtHL-M.jpg)