Trace your lens (or an existing filter) onto thin cardboard. For every filter you want to make cut 2 cardboard circles. Cut the same size holes in the middle of the circles so you have 2 rings of cardboard and place the filter you want
A polarizing filter is one of the most useful filters you can purchase. From eliminating reflections to enhanced saturation of colors, it can help you add that wow factor to your images with very little effort and get great shots straight out of camera.
* How to Use and Buy Polarizing Filters - great for shooting in bright sun to get more vibrant color to skies and landscapes. Hoya is a good brand. Take note of the diameter of your lens before making a purchase as there is a large variety of lens sizes.
Video Tutorial: How to Make the Most of a Polarizing Filter
This infographic is useful because it helps beginners learn when to use filters and when it is the best to use. It allows novice photographers who have never used filters to gain an insight on how filters are used.