Firecrest is a revolutionary new type of ND filter from Formatt-Hitech. Rather than dyed resin, Firecrest is a rare earth metal coating used to create hyper neutral NDs. The filters are made from 2mm thick Schott Superwite glass, and the multicoating is bonded in the middle to increase scratch resistance. Firecrest Filters are neutral across all spectrums, including UV, visible, and infrared.
The Firecrest Soft Edge ND Grad uses Firecrest technology to create the world’s most neutral grad filter, and is the perfect complement to the Firecrest ND filters. Soft edge grads are versatile filters used to balance the luminosity of a bright sky with the terrain below. The soft edge makes it easy to place the filter in the scene, especially over undulating horizons (such as mountains).
Excellent filters, very good quality with no colour cast or loss of image quality. A very quick e-mail response from Customer Services regarding a sizing query as well. Very impressive all-round. It's a pity that the 67 mm filters have now been discontinued though, they are ideal for my micro 4/3 rds system.
But, all in all, highly recommended.