This WonderPana FreeArc XL Core Unit from FotodioX is designed to specifically fit the Sigma 12-24mm f/4 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 two components, a front filter holder and a rear lens collar. Placement of this FreeArc XL Core Unit onto a Sigma 12-24mm f/4 DG HSM Art lens is easily accomplished by sliding the rear lens collar over the rear of the lens until it has achieved a secure fit. Afterward, the front filter holder can be screwed onto the front of the installed rear lens collar.

To use the WonderPana 8.0" Holder Bracket with the FreeArc XL Core Unit for a Sigma 12-24mm f/4 DG HSM Art lens, pre-tapped threaded inserts along the edge of the front filter holder accommodate six of the eight included brass short-screws for correct positioning of the WonderPana 8.0" Holder Bracket's two assembly pieces so that they are placed parallel to each other and can hold a 7.9" wide filter between them. Once the holder bracket and the front filter holder are combined, and the separate collar has been slid over the rear of a Sigma 12-24mm f/4 DG HSM Art lens, the front filter holder with the attached holder bracket can be screwed onto the installed rear lens collar.

After being fitted onto a Sigma 12-24mm f/4 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 12-24mm f/4 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 12-24mm f/4 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. 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: 2. Any way to block lens flares with some sort of hood?

A: The 186mm Slim Circular Polarizer included with this kit does not have front threads, nor is there a hood to fit.

Q: 3. does the canon version works with the new sony 12-24mm lens?

A: No, it only works with the Canon 11-24mm.

Q: 4. Since front holder and rear collar when assembled block hood petal cutouts of 11-24mm lens, how bad is the vignetting?

A: The FotodioX WonderPana FreeArc XL Core Unit Kit for Canon 11-24mm Lens with 186mm Slim Circular Polarizer Filter will not vignette when mounted to the Canon 11-24mm Lens.

Q: 5. I need to use a clear or haze filter. Is it possible to utilize more than one filter at a time-a polarizer and an ND filter?

A: You cannot stack a uv filter on top of the Slim Circular Polarizer Filter included with the FotodioX WonderPana FreeArc XL Core Unit Kit for Sigma 14-24mm Art Lens with 186mm Slim Circular Polarizer Filter. Fotodiox 186mm filters are not designed with a front threads.

Q: 6. Is there ANY vignetting in the corners when using this filter holder for the Sigma 14-24/f2.8 ART?

A: Hi--it is likely that there is very slight vignetting using this filter holder at 14mm on that lens.

Q: 7. does it work with the Rokinon 14mm 2.8 series II?

A: No, the FotodioX WonderPana 145 Core Unit for Rokinon/Samyang 14mm Lens with 145mm Circular Polarizer Filter only works with the Rokinon/Samyang 14mm f/2.8 ED AS IF UMC version one and the Rokinon 14mm T3.1 Cine lens.

Q: 8. 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: 9. does any 145 filter fit on the front of this kit? How does this attach to the lens? I've looked for videos but can't find any. I can see it slides on but what keeps it in place? also if I buy this kit do I need anything besides 145 filters?

A: You will need filter holder # FO66HBWPFA

Q: 10. Can you stack this filters?

A: I stack the filter with the Fotoiox Polorizer on my Nikkoe 14-24 f 2.8 with no issues.