http://www.singh-ray.com/varind.html

So has anyone used this? Any comments or reviews?

Regards, Art.

Just one thing, aren't they polarising filters ?

Use 2 linear polarising filters and you can do the same thing, but you might not want the polarising effect.

Ian

Yeah, that's what it looks like to me. You might also not want to add four air-glass surfaces in front of your lens. You could carry two ND filters to cover a lot of situations.

Just one thing, aren't they polarising filters ?

That's what I thought. I think this line from the web page confirms it: The Vari-ND can be used with most other Singh-Ray filters except Polarizers


Use 2 linear polarising filters and you can do the same thing, but you might not want the polarising effect.

I remember doing this at school with two sheets of polariser. Add overlapping strips of clear sticky tape to create interesting colour effects.

http://www.physics.utoledo.edu/~lsa/_color/34_polarize.htm using pieces of polyester film instead of tape


Steve.