Similar to WACP-1, the WACP-C greatly improves the overall image sharpness.  The WACP-C will provide approximately 3 f-stops of increased corner sharpness when compared to traditional wide rectilinear lenses with a similar field of view behind a dome port.  This means being able to achieve about the same corner sharpness with WACP-C at f/5.6 that you could achieve with your rectilinear lens behind a dome port a f/16.  As a point of comparison, WACP-1 provides approximately 4 f-stops of increased corner sharpness.  

This image from Alex Mustard was shot with the Nikon 28-70mm f/3.5-4.5D and WACP-C

The WACP-C's zoom-through capability means the underwater filmmaker or photographer can capture astonishing wide, medium and close-up shots all with one lens while maintaining optimum optical and close-focus performance. Take for instance the Sony 28-60mm f/4-5.6 lens which receives a field-of-view range of 69º to 130º with the WACP-C. This lens allows for acquisition of more dynamic content on each and every dive without the need for a second camera.

This image from Alex Mustard was shot with the Nikon 28-70mm f/3.5-4.5D and WACP-C