These come supplied with a secure plastic case and cleaning cloths. They come together in one case lightly screwed together. The filters are multi coated and made with optical glass. They feel slender and care needs to be taken when fitting them to your lens so as not to cross thread them. The CPL filter turns smoothly for adjustment. I tested these filters extensively using my Canon RP set to auto white balance and used aperture priority. I used my 24-105 L series F4 lens.

I have not used a black diffusion filter before. When the filters arrived attached together I thought that perhaps they were meant to be used in conjunction with each other. After doing some reading, I don’t think that this is the case.

Most photographers will be familiar with using CPL polarising lens for improving skyscapes and the appearance of water and reflections on water. The supplied CPL filter worked smoothly and exactly as I would expect. There are indentations on the perimeter that let you rotate the filter smoothly.

I tried the black diffusion filter in a number of different situations: portraits of my wife indoors and some photos on the beach nearby. The filter has a subtle effect which is intended to diffuse highlights and produce a slightly blurry and dreamy cinematic effect. I am pretty sure that the filter does this, but to my eyes I found it very hard to see a great deal of difference. I did see some photos on the internet where a sunburst star effect from the sun had been transformed into a glowing hazy ball of sun which was impressive so clearly these black diffusion filters can make a difference.

The CPL filter is very good. I am less convinced that the subtle effects of black diffusion filter would be much good for the type of photography that I do, simply because it is too subtle, but I recognise that it is a good product that will be useful to others.