This WonderPana FreeArc XL Core Unit from FotodioX is designed to specifically fit the Sigma 14mm f/1.8 DG HSM Art lens, as well as a separately available WonderPana 8.0" Holder Bracket. Those items can be combined to allow for the convenient use of two 2.0mm thick filters measuring 7.9" wide, or one 2.0mm thick filter measuring 7.9" wide, along with one FotodioX 186mm round filter behind it. A compatible 186mm inner-pinch lens cap for 186mm FotodioX round filters is also provided.

The included WonderPana FreeArc XL Core Unit consists of a compression front filter ring. Use of the WonderPana 8.0" Holder Bracket is easily accomplished by attaching its two assembly pieces to opposite sides of the FreeArc XL Core Unit using six of that holder bracket's eight included brass short-screws. Pre-tapped threaded inserts along the edge of the Core Unit accommodate those screws and ensure that the two assembly pieces are positioned parallel to each other and can hold a 7.9" wide filter between them. The combined holder bracket and front filter ring can then be attached to a Sigma 14mm f/1.8 DG HSM Art lens by tightening the Core Unit's locking mechanism.

After being fitted onto a Sigma 14mm f/1.8 DG HSM Art lens, the bearing design of this WonderPana FreeArc XL Core Unit allows a WonderPana 8.0" Holder Bracket to be rotated 360°. This permits the use of graduated neutral density and other filters that are enhanced by varied positioning.

A FotodioX WonderPana 8.0" Holder Bracket provides two pairs of filter slots, a configuration that accommodates two compatible rectangular filters. For each rectangular filter that is placed within one of the holder bracket's slots, its position is secured by integrated guides within each slot. These guides apply pressure along both sides of a filter that is sufficient to hold it in place, but permits movement of that filter. This can complement the use of graduated filters whose effect can be adjusted to better suit changing lighting conditions or creative demands by sliding them up or down within a filter slot.

This FotodioX WonderPana FreeArc XL Core Unit includes front filter threads, which allow a FotodioX 186mm round filter to be used along with a WonderPana 8.0" Holder Bracket. If a 186mm round filter is used on the attached WonderPana FreeArc XL Core Unit, the rectangular filter slot closest to the rear of the holder bracket becomes unavailable.

The FotodioX 186mm Center-Pinch Snap-On Lens Cap for Select WonderPana Systems and Filters is a 186mm front lens cap with a squeeze, spring, and snap-on mechanism. It is easy to install as well as remove and can attach to a WonderPana FreeArc XL filter holder system in order to protect the front element of a lens that any one of those systems is mounted on. Additionally, with the exception of the FotodioX Ultra Slim filters, this lens cap can be used to protect a FotodioX 186mm filter that is mounted on a FotodioX WonderPana FreeArc XL filter holder system.

Lens caps protect your lens or filter from scratches, fingerprints, and the elements when the lens or filter is not in use.

For Sigma 14mm f/1.8 DG HSM Art    WonderPana FreeArc XL Core Unit    Use with WonderPana 8.0" Holder Bracket    With Bracket, Holds 7.9" Wide Filters    Bracket Rotates 360° with FreeArc XL    Combine a 7.9" Wide and a 186mm Filter    186mm Slim Circular Polarizer Filter    1.25 to 8x Filter Factor, +0.3 to 3-Stop    Helps to Eliminate Reflections and Glare    186mm Center-Pinch Snap-On Lens Cap

• Compatible with a Sigma 14mm f/1.8 DG HSM Art lens
• Accommodates a separately available WonderPana 8.0" Holder Bracket
• With a WonderPana 8.0" Holder Bracket, allows for the convenient use of two 2.0mm thick filters measuring 7.9" wide, or one 2.0mm thick filter measuring 7.9" wide, along with one FotodioX 186mm round filter behind it
• Allows a WonderPana 8.0" Holder Bracket to be rotated 360° so that rectangular filters placed within it can be angled to the best position relative to the subject in front of the camera
• Includes 186mm front filter threads, which allow a FotodioX 186mm round filter to be used along with a WonderPana 8.0" Holder Bracket
• Constructed from aluminum alloy for durability while remaining lightweight
• 186mm front lens cap with a squeeze, spring, and snap-on mechanism
• Nylon pouch for storage and transport

Related Questions and Answers

Q: 1. Will this fit the Sigma 14-24 DG N sony e Mount?

A: Yes, if it is the Sigma DG DN Art lens.

Q: 2. Where is it made?

A: It says Made in China on the lens ring.

Q: 3. Will this work with Lee and Singh Ray 100mm x 150mm filters?

A: The Absolute Core Filter Holder is designed for super wide angle lenses and wide angle filter holders. It will not be compatible with a standard filter holder like a 100 x 150mm size.

Q: 4. Are they multi-coated? I'm asking since their description said YES (wrong description?) but one of reviewers said NO. Thanks.

A: Yes they are multi coated 12 layers, see the specs on the web page..

Q: 5. Does the filter holder or filters block any of the field of view of sigma 14-24 mm dg hsm f mount lense?

A: The FotodioX WonderPana FreeArc XL Core Unit Kit for Sigma 14-24mm Art Lens with 8.0" Holder Bracket does not vignette on the Sigma 14-24mm f/2.8 DG DN Art Lens.

Q: 6. Does this ND filter work for the canon xf100

A: Yes the Canon XF100 has 58mm diameter filter thread so these filters will fit.

Q: 7. Does the filter holder or filters physically block any of the field of view of sigma 14-24 mm dg hsm f mount lense? Not dg dn

A: FotodioX WonderPana FreeArc XL Core Unit Kit for Sigma 14-24mm Art Lens with 8.0" Holder Bracket does not block any of the filed of view, also the filters don't block it either.

Q: 8. Will this fit my tamron 15-30 when used with the wonderpana holder

A: Yes. This filter is 145mm and the Wonderpana WNDPN145-ESNTLCP-TMR1530 adapter is 145mm so it screws onto the Wonderpana; just be sure to get the Tamron specific adapter

Q: 9. Will it work with Rokinon AF 14mm f2.8 lens for Canon EF?

A: No, the Rokinon AF 14mm f/2.8 Lens for Canon EF cannot work with this Fotodiox accessory.

Q: 10. Did anyone have a hard time attaching this filter to a lens?

A: No issues , see if you have a spec of dust on the threads