This 4-stop FotodioX WonderPana FreeArc Core Unit Sigma 14mm Lens Filtersfeatures a filter ring with 145mm front filter threads. With a 16x filter factor that provides a 4-stop exposure reduction. Its 1.2 optical density creates a darkening of the entire image, allowing you to photograph with a wider aperture or slower shutter speed than normally required. By slowing your exposure time or increasing your aperture, you are able to control depth of field and convey movement more easily. Neutral density filters do not affect the coloration of the image and are ideal for pairing with other filters.

To prevent internal ghosting and reflections, this filter includes multiple layers of anti-reflection coating. These coatings also offer greater protection to the filter substrate and help it to stay clean for longer than with uncoated filters. This filter is constructed from optical glass for clarity as well as color fidelity and features an aluminum-alloy filter ring for durability while remaining lightweight.

For Sigma 14mm f/2.8 EX Aspherical HSM    WonderPana FreeArc Core Unit    Use with WonderPana 6.6" Holder Bracket    Bracket Rotates, Holds 6.6" Wide Filters    145mm Solid Neutral Density 1.2 Filter    16x Filter Factor, 4-Stop    Darkens Entire Image    145mm Solid Neutral Density 1.5 Filter    32x Filter Factor, 5-Stop    145mm Center-Pinch Snap-On Lens Cap

1.2 optical density filter darkens the image, allowing you to photograph with a longer shutter speed or wider aperture than normally required.

Providing a 4-stop exposure reduction, this filter allows you to control depth of field and convey movement more easily.

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

Includes multiple layers of anti-reflection coating to prevent internal ghosting and reflections.

Constructed optical glass for clarity and color fidelity.

145mm front filter threads allow for use with other filters.

Durable, lightweight aluminum-alloy filter ring with one brass side knob allows the filter to be easily screwed on or off.

Filter pouch included for storage and transport.

Related Questions and Answers

Q: 1. Does this lens have a built-in USB port for firmware upgrades?

A: The Sigma 14mm f/1.4 DG DN Art Lens (Sony E) does not have a USB port. With Sigma lenses for Sone E mount the firmware is upgraded via the camera.

Q: 2. can the hood be removed for underwater housing?

A: The hood cannot be removed

Q: 3. Is there any kind of crop factor to use this lense on a Sony A6300?

A: Any lens attached to a crop sensor camera will have 1.5x crop factor. So this on the sony a6300 will be 14mm x 1.5 = 21mm

Q: 4. which lens collar is working for that combo? you know sony a7 mount is not strong enough to carry this lens and adopter .. so which lens collar is working with that case?

A: Thank you for your interest in Sigma products. There is no collar for this lens. This lens is only 1,170g or 41.27oz and camera can easily handle the wait of the lens and the Mount converter.

Q: 5. can i use this on my canon 80d?

A: Thank you for your interest in Sigma products. Yes, you can use it on your Canon 80D.

Q: 6. Does this work with Lumix Gh4 or G7?

A: The Sigma 14mm f/1.4 DG DN Art Lens (Leica L) is incompatible with the Panasonic Lumix GH4 Mirrorless Camera and the Panasonic Lumix G7 Mirrorless Camera. Both cameras use micro 4/3rds lenses. Since the Sigma 14mm is for full-frame cameras and your cameras have a 2X crop factor, the manual focus Venus Optics Laowa 7.5mm f/2 MFT Lens for Micro Four Thirds (Auto Aperture Version), BH #VE7520MFTAEB, is a good option.

Q: 7. I am worried about the USB dock. With a D850 should I expect to have to purchase a focus chart? Will Auto AF fine-tune be good enough?

A: In general photography, because of the depth of field, you should not anticipate a problem. At lens wide open as in shooting the stars, you should at least try it out and see if improvements are needed. If so, the dock might be the way to go.

Q: 8. Will this lens be released for the Nikon Z-mount? I certainly hope so as there's no 1st-party equivalent.

A: Sigma has not announced plans for a Nikon Z-mount 14mm f/1.4 lens yet; the Sigma 14mm f/1.4 DG DN Art Lens is currently available in E-mount or L-mount only.

Q: 9. What is the outer diameter of the lens hood? Any way to adapt a 95mm matte box?

A: The Sigma 14mm f/1.4 DG DN Art Lens (Sony E) has an outer diameter of 102mm around the lens hood. There are no front threads on the lens to connect with a threaded system. Also, the lens has a 114.2° angle of view, so it will most likely vignette in a matte box.

Q: 10. How well does this one work for group fotos? Like nice and clean crisp?

A: Great. It has a great quality, build and feel, high-quality lens. It has a solid barrel that is made from a combination of metal and tough plastic depending on sensor combination will determine how much AF fine tuning is needed.