This WonderPana FreeArc XL Core Unit from FotodioX is designed to specifically fit the Sigma 14-24mm f/2.8 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 14-24mm f/2.8 DG HSM Art lens by tightening the Core Unit's locking mechanism.

After being fitted onto a Sigma 14-24mm f/2.8 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 14-24mm f/2.8 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 Center-Pinch Snap-On Lens Cap

• Compatible with a Sigma 14-24mm f/2.8 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. How would you protect this lens from UV if a typical UV filter won't work on it?

A: UV filters are not fully necessary but if you need a UV solution, several companies such as LEE and NiSi make filter holder systems for this lens.

Q: 2. This looks to be the same 14-24 art made for canon and Nikon a year ago...except now its for the e mount. Is this correct?

A: The lens element formula is different: One FLD Element, Five SLD Elements. The Canon and Nikon: Three FLD Elements, Three SLD Elements.

Q: 3. How does the rear filter work? Is there a front filter thread?

A: You must cut gel filter to fit the rear holder. It must be dust and scratch free or the sensor will pick those up. Since you cannot adjust the rear filter, grads or Polarizers are not normally used. Basically you are limited to ND's. Here are the available gel filters. https://bhpho.to/2XIaTYY Like most any extreme wide angle lens, the front element is so bulbous, a screw-in filter is not possible. What should be available soon from the main filter manufacturers such as Lee, NiSi, and FotoDiox is a filter holder that will take 150mm rectangular filters.

Q: 4. Is this lens internal zoom?

A: This lens does offer an internal zoom.

Q: 5. What Filter Size fits this lens? Do 67mm filters fit?

A: Unfortunately it will not. This lens does not have a filter thread, 67mm or other threaded filters will not fit this lens.

Q: 6. Will this lenses work on the new Leica SL2

A: Yes, it will work on the Leica SL2.

Q: 7. Will there be an RF version of this lens?

A: Only the execs and engineers at Sigma might know the answer to that.

Q: 8. Will it work with 100mm filter holders?

A: The Sigma 14-24mm f/2.8 DG DN Art Lens is to wide a lens to work with 100mm filters. One can use 150mm filters with the NiSi S6 150mm Filter Holder Kit with Pro CPL for Sigma 14-24mm f/2.8 DG DN Art, BH #NIS6HCPPS14S (https://bhpho.to/3r8grOc).

Q: 9. Good choice for landscape w/ A7R IV? and 61mp?

A: Yes Sigma 14-24mm f/2.8 DG DN Art Lens for Sony E is very sharp and a great option to use with high resolution 61 MP sensor of the A7RIV.

Q: 10. Is the focus mechanism fly-by-wire or are focus points always the same, allowing for more accurate manual focus?

A: This lens is focus by wire.