Has anyone used these filters

[Maddog]

Oh cool! I had not seen this. Just ordered a set!
Polar Pro needs to do some SEO! I searched for this and they never came up.
Thank you!

So what would be the right way to use these? When to use them?
Which colors are used for what?

 

[dcal]

So what would be the right way to use these? When to use them?
Which colors are used for what?

I will use them when I need to balance the sky and ground a little better. Probably sunrises/sunsets. Here's an example of what it will get you from the ground: Grad ND Filter test