Who's who in optical filters

There are advantages in using both screw and square filters. Screw in filters attach to your lens’ filter thread and are the least bulky option. They are often better quality too because they are usually made of glass and don’t scratch easily. If you have a number of lenses with different filter thread sizes it can be an expensive option and that’s where square filters have the advantage. These fit into a holder which in turn attaches on to your lens via a removable adaptor ring. You only need one holder and one filter which can be attached to a variety of lenses using different size adaptor rings. The range of filters available in the square system is usually broader too, with some unusual special effects from the Likes of Cokin and a much wider range of colour correction filters from the specialist producers, such as Lee Filters.

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