The 100 x 150mm Blackstone Hard-Edge Graduated IRND 0.9 Filter from Wine Country Camera is a rectangular filter that helps to darken specific areas of an image, such as bright skies, while allowing for a normal, unaffected exposure in the other regions of the image. The filter is densest at the edge and tapers to clear by the middle, with a hard-edged line of transition between the dense and clear areas. A neutral density filter with a hard-edged line of transition is useful for images which include defined horizon lines. Neutral density filters do not affect the coloration of the image, and this filter provides up to a 3-stop reduction in light from entering the lens.
The design of this filter has been optimized for use with digital sensors and to promote nearly flat attenuation of visible and infrared light. Due to imaging sensors' greater susceptibility to infrared light compared to traditional film, color casts can occur when photographing darker subjects that require increased exposure times. To provide neutrality across the visible and infrared spectrums in order to eliminate color casts and ensure cleaner, truer blacks, one layer of Blackstone ND Coating is applied to each of this filter's surfaces. The Blackstone ND Coating is also designed to help minimize any effect on a digital camera's resolution when using this filter.
This 100 x 150mm Blackstone Hard-Edge Graduated IRND 0.9 Filter is constructed from Schott Ultra-White Glass for clarity as well as color fidelity and measures 2mm thick.
The 100 x 150mm Blackstone Hard-Edge Graduated IRND 0.9 Filter is pre-installed within a Wine Country Camera 100 x 150mm Filter Vault, which is designed to encase the edges of a 100 x 150mm, 2mm thick filter for use within a separately available Wine Country Camera 100mm Filter Holder. By encasing the sides of an installed filter, this filter vault helps to eliminate stray light, which could have unwanted effects on exposure. Additionally, the Wine Country Camera 100 x 150mm Filter Vault reinforces an installed filter's rigidity while preventing its sides from having to come into direct contact with a filter holder's slots. This protects those side surfaces and promotes sharp results by ensuring that the filter remains flat.
Installation of a compatible filter is accomplished by first turning the Wine Country Camera 100 x 150mm Filter Vault's brass Wine Coin lock into the open position. Located along the front of the filter vault's inner and outer top edges, the Wine Coin is a flat, disk cam lock that features a straight edge on one side and a rounded edge at the other. When the lock's straight edge is aligned with the filter vault's inner edge, a 100 x 150mm, 2mm thick filter can be set within the front of the filter vault. The Wine Coin can then be turned so that its rounded edge obstructs the installed filter, securing it within the filter vault.
A separately available Wine Country Camera 100mm Filter Holder includes two outer slots that can each accommodate this 100 x 150mm Filter Vault. The sides of the filter holder also feature quick release buttons that are each dedicated to one of those slots. When pressed, they allow a Wine Country Camera 100 x 150mm Filter Vault within a Wine Country Camera 100mm Filter Holder's corresponding slot to be adjusted upward or downward relative to the subject. When used with either of a Wine Country Camera 100mm Filter Holder's two outer slots, an integrated safety-catch system prevents this 100 x 150mm Filter Vault from accidentally sliding out of the filter holder.