David L Abbee

I own a Tiffen Digital Diffusion FX/1, and this filter DOES introduce speckles in the bokeh. Pretty horrible in fact (shaped like horseshoes). When it doesn't show up though, it truly adds to the Alexa emulation. Very transparent, but makes blurry backgrounds creamier. It seems to add a tiny bit of thickness to high contrast details, while softening light textures like skin. Unfortunately, the extremely strong artifacts in the bokeh balls is a no-go for me, so I stopped using it.