Normally when we think of Variable ND filters, we think about a circular filter. One that gives us the ability to change the exposure simply by rotating the front element. Something like this K&F concept one I recently reviewed here.
But what if you wanted both the convenience of a Variable ND filter AND the ability to use graduated or other filters. This would give you far more control over the scene that you are going to capture?
Well! Haida has released a brand new filter the ‘Insert Variable ND filter‘.