Square ND

A square filter is a type of camera filter that comes in a square shape allowing photographers to use the same set of filters across lenses with different thread sizes by employing a filter holder system.

The choice between round and square ND filters often depends on personal preference and the specific needs of the photographer. Square filters are more versatile, especially when using multiple filters simultaneously, while round filters are simpler and more convenient for basic use.

First attach the filter holder to your lens and slide the filter into place before composing your shot. Adjust the filter position for desired light reduction.

Yes, you can stack multiple square ND filters for increased light reduction effect. However, keep in mind that stacking filters may introduce more potential for optical artifacts, vignetting, or a reduction in image quality. It's advisable to test the specific combination of filters you intend to use to ensure the desired effect without compromising image quality.