Formatt Hitech Firecrest IRND Graduated Filter Soft ND 0.9

ND graduated filters (ND GRAD) reduce the brightness of a specific part of the image without changing the color or affecting the other areas. This gives you more control over the exposure of the image.

Graduated filters are most often used to darken the sky, as these areas are often too bright. When the sky is darkened, it results in more drama and emphasis on the foreground.

Firecrest ND are revolutionary ND filters from Formatt-Hitech. Unlike standard resin filters, these filters are completely color neutral and have no color cast. The filters are made of 2 mm Schott Superwite glass. The coating is bonded in the center to achieve the highest scratch resistance.

Features:

- Firecrest ND Graduated Filter

- Soft gradient edge for smooth transitions

- Made of 2 mm Schott Superwite glass

- Fits in 100 mm filter holder

- High scratch resistance, non-fatigue material

- Manufactured in England under advanced computer aided quality control

How do you calculate the aperture reduction of ND filters?
The density of ND filters is given in steps of 0.3. To get the aperture reduction, first multiply the value by 10 and then divide by 3.

Example:

0.3 x 10 = 3 | 3 = 1 f-stop

1.2 x 10 = 12 | 3 = 4 f-stops

4.8 x 10 = 48 | 3 = 16 f-stops