Neutral Density Filter test?

Image taken without any Filters (bare lens) Image taken with settings:

0.5 sec shutter speed

f/22- for no depth of field but focused image(tripod needed)

Iso 100

The image bellow was taken with the Cokin Neutral density filter 4- 0.6, as you can see it has prolonged the shutter speed hence the blurring within the trees. It has also brought out the blues within the sky.It has also increased the greens within the grass and other colors.

this image was taken with the settings:

0.5 sec shutter speed

f/22

Iso 100

The image bellow was taken with the neutral density filter 8-0.9 as you can see again with the neutral density 8-9 i has increased the contrast and tones of the image even more the sky is more blue and the green is slightly more vivd. This filter allowed me more time to experiment,due to the darkness of the filter extending the shutter speed allowing time to add effects. This image was taken with the setting:

0.5 sec shutter speed

f/22

Iso 100

The image below was taken with the neutral density filters used above, the nd 4-0.6 and nd 8-0.9. As from this image you can see that 2 filters has changed the color of the image and given it a magenta tint, as of right now i don't know why its done this but i intend to go onto do some research as to why this happened.I had also noticed that with my filters if i use more than one it also comes out with a pink tint see in the next post for description.

This image was taken with the settings:

1.3 sec shutter speed

f/22

Iso 100

This image below was taken with the neutral density 8-9 and also a neutral density grad hence the darker sky.If this shoot was a landscape this would of been effective.This Image was taken with the settings:

0.6 sec shutter speed

f/22

Iso 100

As you can see with these image's there is a mark on the image i was aware of this at the time. This mark was made from dust on my filters. I learnt from this test that make sure you're filters are spotless with dust before shooting. Unfortunately the Cokin filters attract dust so its hard to keep on top of the dust, but i know to check every time now.