Firecrest Ultra are the next generation in Neutral Density filtration for photographers.Firecrest remain (December 2017) the only professional grade filter that is bonded to protect the coating in the centre of the filter giving the filter enhanced durability over coated products and protecting your investment.With Firecrest Ultra we have taken this process one step further and we now "lap and polish" the filters, a process previously only carried out on our cinema grade filters. So as well as the superb neutrality and durability that Firecrest deliver, the filters now benefit from enhanced clarity and sharpness and are the most optically flat photographic ND filters in the world, regardless of focal length.Firecrest Ultra are available in 100x100mm and various circular sizes and in a range of popular densities from 1 to 10 stops. 13 and 16 stops and now 18 to 24 stops.Specs:- Filter Type: Solid ND- Shape: Rectangle- Rectangular Size: 100.0 x 100.0 mm- Filter Thickness: 2 mm- Filter Material: Glass- Coatings: Multi-Coating, Resistance CoatingIn the Box:- Formatt Hitech 100 x 100mm Firecrest Ultra ND Filter- Filter Case