Light Pollution Filter for my Nikon D7000

For imaging with my Nikon D7000 camera, I finally bought a Light Pollution clip-in filter. I ordered a Hutech LPS-D1-N4 filter. It arrived within 2 days! Installation was very easy:

This how the filter looks:

and from the other side:

It's a little tricky to see, but the filter has some screws that you can see in the second image. This side has to go to the outside/top when you insert it.

Inserting it:
First, put the filter into the camera

like this:

Then, with a small screw driver, push it down (of course only on the plastic parts):

Until it's all snug in:

Now put the lens back on. If you inserted the filter the wrong way round, focusing doesn't work.

Here is the effect on natural day light:

Without filter:	With filter:

You can see the blueish hue on the right hand side.