Filters Gaussain Blur, Lens Blur, Motion Blur

Photoshop has over 100 Filters devided in 14 categories.
The filters can do important work.Here i will show you all standart filters and i will explain important things about them.
The filters are lockated in the Filter menu.
Lets start with the filters Blur sub menu:

Picture before filter: Gaussain Blur, Lens Blur, Motion Blur.

Gaussain Blur
It adds some details with lower frequency and adds foggy effect.
Picture after filter Gaussain Blur:

Lens Blur
This filter has many options that you can change a lot.It looks like the upper filters from the blur category.

Picture after filter Lens Blur:

Motion Blur
The filter is used to fog by a change of the distance of the image.Thats how you set the angle and the way:

Picture after filter Motion Blur: