The LEE Filters Big Stopper redefined long exposure when it was first launched in 2011, and it is still as popular today as ever. 

The slight blue cast is easily removed in post production using the colour temperature slider, but a lot of photographers leave it unchanged - the cool look and slight vignette on wider angles give that classic Big Stopper image that is still so popular.

If you want a long exposure filter with no cast and no vignetting, the LEE Proglass IRND range is also available.