The Wine Country Camera Blackstone Hard-Edge IRND 0.9 Filterfrom Wine Country Camera Blackstone Hard-Edge IRND 0.9 Filteris 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 150 x 170mm 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 150 x 170mm Blackstone Hard-Edge Graduated IRND 0.9 Filter is pre-installed within a Wine Country Camera 150 x 170mm Filter Vault, which is designed to encase the edges of a 150 x 170mm, 2mm thick filter for use within a separately available Wine Country Camera 150mm 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 150 x 170mm 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 150 x 170mm 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 150 x 170mm, 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 150mm Filter Holder includes an outer slot that can accommodate this 150 x 170mm Filter Vault. The filter holder also features a quick release button that is dedicated to the slot. When pressed, it allows a Wine Country Camera 150 x 170mm Filter Vault within a Wine Country Camera 150mm Filter Holder's outer slot to be adjusted upward or downward relative to the subject. When used with a Wine Country Camera 150mm Filter Holder's outer slot, an integrated safety-catch system prevents this 150 x 170mm Filter Vault from accidentally sliding out of the filter holder.

8x Filter Factor, 3-Stop    Reduce Exposure in Selective Areas    Hard-Edged Line of Transition    Reduce Shutter Speed, Widen Aperture    Neutral Results, Visible & IR Spectrums    Schott Ultra-White Glass Construction    Wine Country Camera Filter Vault    For Wine Country Camera 150mm Holder    Protects Filter Edges    Keeps Filter Surfaces Flat

150 x 170mm graduated neutral density filter darkens bright areas of an image, such as skies, while leaving the remainder of the frame unaffected

8x filter factor provides up to a 3-stop reduction of light in selective areas

Hard-edged line of transition between the dense and clear areas

Useful for images which include defined horizon lines

Filter does not affect coloration of the image and is ideal for use with other filters

Each surface includes one layer of Blackstone ND Coating that attenuates infrared light as well as visible wavelengths to maintain color neutrality and suppress color casts due to increased exposure times

Blackstone ND Coating is designed to help minimize the filter's effect on a digital camera's resolution

Constructed from Schott Ultra-White Glass for clarity and color fidelity

Related Questions and Answers

Q: 1. How is the iris controlled on a Nikon F-mount camera? Is there a 'G' style control lever? Or is it purely electronically controlled?

A: The aperture is electronically controlled.

Q: 2. (Please ignore or delete my previous question about the difference between the FireFly and Blackstone iterations of this lens -- it is answered in the Overview -Duh! - My bad.) Are the FireFly and Blackstone editions identical in terms of image quality? Thank you!

A: yes Mark the firefly and the blackstone are identical in image quality. The only difference is between them is that the blackstone is fully weather sealed.

Q: 3. What is the difference between the FireFly and Blackstone iterations of this lens? What do you get with the extra money for the Blackstone? Thank you!

A: The Blackstone has a metal body and engraved numbers. The Blackstone is heavier as well. Optically they are the same.

Q: 4. Which square filter holder would work for this lens?

A: There are several options but I would recommend this Format kit: https://bhpho.to/3qYQvBH

Q: 5. Does the lens hood come off or is it fixed to the lens?

A: Yes, The lens hood is removable, at the clearly visible separation line above the 15mm Irix etc logo. The lens works well for me. All lenses are a compromise and you should read the many available reviews.

Q: 6. Does the IRIX 15 have a focus confirmation chip for Nikon?

A: Yes, the Firefly has a focus confirmation chip for Nikon.

Q: 7. Will this be able to be mount on a canon mirrorless full frame with the adaptor?

A: Yes this would be able to mount on a Canon Mirrorless Full Frame camera with the EF-RF adapter.

Q: 8. Is this lens focus by wire?

A: Not focus by wire, it is full manual focus.

Q: 9. Can the aperture of this lens be controlled by the BlackMagic Pocket Cinema 6K camera?

A: Although the Black Magic Pocket Cinema 6K Camera with a Canon EF can accept this lens, it has not been tested to our knowledge. Your results may vary.

Q: 10. Will this work on the BMPCC4K with a Metabones Speedbooster (MFT to EF) ? Will there be vignetting?

A: Both the 0.71 and the 0.64 Metabones Speedbooster, show little to no vignetting.