|Photographed in the early morning using Nisi 10 Stop neutral density and Nisi 2 stop reverse graduated neutral density filters|
This is part two of a multi-part essay on square filter systems available to South African photographers (although this is applicable internationally as well). The first part on the holder systems themselves can be read here. An earlier article on shooting long exposure photography can be read here.
Prior to the advent of digital photography, film photographers relied heavily on the square filter system in order to balance contrast in a scene. More particularly, to balance the bright sky against the comparatively darker foreground. The graduated neutral density (GND for short) was the most important reason for having a square filter system. Solid neutral density filters (ND for short) tended not to be the primary reason you invested in a filter system to start with. In fact, it wasn’t really until digital still photography overtook film that solid neutral density filters became a ‘thing’ that photographers looked for. Looking back at an old Cokin brochure (which I think is from the late 1990s) there are only three options for a solid neutral density for their square system; these being 1, 2 and 3-stop filters. Now however, we get filters that block as much as 15 stops of light from passing through them.