Before computers and digital cameras, lens filters were among the indispensable tools filling every serious photographer’s bag. Fast forward to the present and the first things that come to many minds when they hear the words “photo filter” are overused color profiles and distorted selfies on social media. Today, editing software can simulate the effect of many types of lens filters, reducing the need for photographers to invest in and carry around entire collections of additional glass. However, there are still a number of filters that cannot be recreated easily (or at all) with a computer. That is the topic of this article.
Polarizing Filters
Polarizing filters remain essential accessories for just about every photographer. Two types of polarizers exist: linear and circular. Both reduce reflections, boost saturation, and darken blue skies. The most unique of these attributes is the ability to cut down on non-metallic reflections, making it easier to shoot through windows or beneath water surfaces without distracting glare. This ability cannot be added back into an image on a computer.Circular polarizers are linear polarizers that have been updated to include a quarter wave plate. Why does that matter? A quarter wave plate prevents cross-polarization, a phenomenon that disrupts autofocus systems and can darken images when using an SLR camera. Note that polarizing filters require increasing your exposure by approximately 1.5-2 stops. For a more thorough discussion of circular polarizers.
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