How much of the quality do this custom bokeh filter things degrade? They cover 90% of the lens so I would think they introduce some vignetting or you will have to raise the ISO right?
https://www.youtube.com/watch?v=H5jjr_vKruUI am only concern with the video aspect. I prefer the pentagon bokeh balls but all my lenses have perfect circular bokeh balls. Would this be an alternative to just getting a proper lens that produces pentagon bokeh?