A selection of photographic filters
Many people argue that filters are not required in the digital age, however I have to disagree.
Some effects cannot be done in the processing stage and there are two types of filters that are, in my opinion essential. These filters are the polarizing filter and the neutral density filter, as pictured here.
In order to keep costs down you can buy the filters in the biggest lens size and then get step down rings so they can be used on all of your lenses.