If there is one thing I have grown to love about photography, it is the ability to capture, control, and manipulate time. Photography is giving us the option to see things in ways that are impossible to achieve with our naked eyes. This opens up a whole new world of creative options.
While cameras do offer us a fair amount of control using ISO, shutter, and aperture, we sometimes need to look at other options to get extremely long exposures. This is particularly true where there is a lot of light around. Add that to the wide shots you can get with a Sigma 14-24mm weird construction, and you soon realize the need for something like the Haida M15 filter holder system.