The 4 x 4" Formatt Hitech ND Blender Filter 4x4 1-Stopfrom Formatt Hitech ND Blender Filter 4x4 1-Stopis compatible with filter holders that can accommodate 4 x 4" rectangular filters up to 4mm-thick. This filter is densest at one edge where it corresponds to a reduction of light from entering a lens by up to one stop and tapers to clear at the other edge. Its gradation can be used to selectively darken an image from edge-to-edge. While this graduated blender filter's 0.3 density can be applied to bright skies, the remaining regions of the image can be exposed with a progressively decreasing effect.

This filter is constructed from Schott glass for clarity and color fidelity. A padded pouch is included for storage and transport.

0.3 Optical Density    Graduated Effect Over Entire Image    Schott Glass Construction    No Transition Line    Allows Reduced Shutter Speed    Allows Wider Aperture    Includes Padded Pouch

• Compatible with filter holders that can accommodate 4mm-thick, 4 x 4" rectangular filters
• Densest at one edge where it corresponds to a reduction of light from entering a lens by up to one stop and tapers to clear at the other edge
• Darkens bright areas of an image, such as skies, while the remaining regions of the image can be exposed with a progressively decreasing effect
• Maximum 0.3 density corresponds to a 2x filter factor
• Constructed from Scott Superwhite Glass for clarity and color fidelity
• Padded filter pouch for storage and transport

Related Questions and Answers

Q: 1. Is this recommended for digital cameras?

A: The Hoya 72mm Neutral Density (ND) 0.3 Hoya Multi-Coated (HMC) Glass Filter is recommended for both digital and film cameras. Hoya's Pro Digital line of filters are slimmer but still have threading on both sides of the filter. Ultra-thin filter frames help to avoid vignetting on super wide angle lenses while the front threads mean they will also hold a lens cap. HMC filters feature a 3 layer multi-coating while their Pro Digital line's multi-coating is optimized for use with digital sensors.

Q: 2. Does it have a front filter thread to stack another filter?

A: Yes the Hoya 77mm ND (NDX8) 0.9 Filter (3-Stop) has 77mm front threads so you can stack additional filters.

Q: 3. How significant is the benefit of the extra cost multicoating on the BW neutral density filter (3 stop version, 58mm) An extra expense I can avoid?

A: I think it is money well spent. As you know filters tend to get dirty fast so I'm cleaning them a lot. I've had the cheaper ones and I've noticed hair line scratches from wiping over an extended period of time.Good luck.Bart W

Q: 4. Does this filter case any noticable vignette?

A: No.

Q: 5. is this ND filter ideal for video use? I plan on using it with a Sony FDR-AX33 4K camera.

A: Actually the newest ND filter by Hoya (the SOLAS filter series) would be more suited for video work:https://a href= http://www.bhphotovideo.com/c/product/1285182-REG/hoya_xsl_46irnd09_46mm_solas_0_9_irnd.html target= _blank www.bhphotovideo.com/c/product/1285182-REG/hoya_xsl_46irnd09_46mm_solas_0_9_irnd.html/a

Q: 6. The rear thread is 82mm but what size is the front thread?

A: Same tread on each side of the filter.

Q: 7. Can the Hoya ND filters be stacked?

A: Yes. But be mindful that the following units stacked can cause vignette issues depending on lens being used.

Q: 8. Does this filter have a hard stop at each end of the range? My 62mm Bower variable ND does, just wondering if this version does as well. Thanks.

A: Yes, this filter has hard stops.

Q: 9. is this compatible with hasselblad hcd f4 28mm which does have a diameter of 95mm?

A: If the lens has threads on the front then it should fit.I use it on a Sigma 150-600

Q: 10. will this adapter ring work with the lee 100mm system?

A: Yes, this adapter is designed for the LEE 100mm system.