Digital photography and post-processing may have done away with the need for certain types of lens filters but there are still a number of filters that photoshop cannot replace. Watch this 8.5-minute video by DPReview which tells you which filters you should still consider keeping in your camera bag.
The four filters are the circular polarizer (CPL), neutral density (ND), and graduated neutral density (GND) filters.
CPL filters help to reduce unwanted glare from reflected surfaces (e.g water) by selectively absorbing or passing light depending on its polarization
ND filters help to block some of the light entering your camera, allowing you to use an exposure triangle combination that would have otherwise resulted in overexposed photos
UV filters may not do anything optically for modern digital cameras, but they can be used to prevent dust, smudges, and scratches from damaging your lens’ front element
GND filters help to prevent overexposing and clipping details in skies when you are shooting landscape photos and other tricky lighting environments.
