The Nikon Nikkor SW 90mm f/4.5 is a wide-angle large format lens with a 235mm image circle and 105-degree coverage, identical in image circle to the f/8 version but with a brighter maximum aperture. At 600g with an 82mm filter thread, it is larger and heavier than the f/8 variant. The faster aperture provides a significantly brighter ground glass image, making focusing easier in dim conditions, particularly beneficial for studio use.