The FotodioX WonderPana FreeArc Kit for Sony 12-24mm Lensis a two-piece assembly designed to be used in combination with a FotodioX WonderPana FreeArc Core Unit, a WonderPana 145 Core Unit, or a WonderPana FreeArc Aluminum Step-Up Ring. A WonderPana Core Unit or a WonderPana FreeArc Aluminum Step-Up Ring with the WonderPana 6.6" Holder Bracket attached can then allow for the convenient use of two 2.5 to 4.0mm-thick filters measuring 6.6" wide, or one 2.5 to 4.0mm-thick filter measuring 6.6" wide along with one FotodioX 145mm round filter behind it.

Use of this holder bracket is easily accomplished by separately attaching its two assembly pieces to opposite sides of a WonderPana Core Unit or a WonderPana FreeArc Aluminum Step-Up Ring using the six included brass short-screws. Pre-tapped threaded inserts along the edge of a WonderPana Core Unit or FreeArc Aluminum Step-Up Ring accommodate those screws and ensure correct positioning of the two assembly pieces so that they are positioned parallel to each other and can hold a 6.6"-wide filter between them. The combined WonderPana Core Unit, or WonderPana FreeArc Aluminum Step-Up Ring, and WonderPana 6.6" Holder Bracket can then be attached to a compatible lens.

For WonderPana Core Units that consist of a rear lens collar and a front filter holder, pre-tapped threaded inserts along the edge of the front filter holder accommodate the six brass short-screws for correct positioning of the WonderPana 6.6" Holder Bracket's two assembly pieces. Once the holder bracket and a front filter holder are combined, and the separate collar has been slid over the rear of a compatible lens until it has achieved a secure fit, the front filter holder with the attached holder bracket can be screwed onto the front of the installed rear lens collar.

After being fitted onto a compatible lens, the bearing design of the WonderPana FreeArc Core Units and WonderPana FreeArc Aluminum Step-Up Rings allows a WonderPana 6.6" Holder Bracket to be rotated 360°. This permits the use of graduated neutral density and other filters that are enhanced by varied positioning. While a WonderPana 145 Core Unit does not include a 360° rotating mechanism, eight pre-tapped threaded inserts all around its edge allows the WonderPana 6.6" Holder Bracket to be installed in 45° increments so that rectangular filters placed within it can be angled to the best approximate position relative to the subject in front of the camera.

The FotodioX WonderPana 6.6" 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 can be secured using the included brass long-screws. Pre-tapped threaded inserts along the outside of the holder bracket allow the long-screws to each apply pressure to a spring-loaded retainer within each filter slot. When a pair of the long-screws are used, the level of grip upon a rectangular filter can be varied, which 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.

Each FotodioX WonderPana Core Unit or WonderPana FreeArc Aluminum Step-Up Ring includes front filter threads, which allow a FotodioX 145mm round filter to be used along with this filter holder. If a 145mm round filter is used on the attached WonderPana Core Unit or WonderPana FreeArc Aluminum Step-Up Ring, the rectangular filter slot closest to the rear of the holder bracket becomes unavailable. The WonderPana 6.6" Holder Bracket features a lightweight, aluminum-alloy construction that has a corrosion-resistant, black anodized finish for durability. A rigid pouch is included for storage and transport.

For Sony FE 12-24mm f/4 G    WonderPana FreeArc Core Unit, Lens Cap    WonderPana 6.6" Holder Bracket    6.6 x 8.5" Graduated ND 0.9 Filter    Hard-Edged Line of Transition    Up to 8x Filter Factor, 3-Stop    Reduce Exposure in Selective Areas    145mm Circular Polarizer Filter    1.25 to 8x Filter Factor, +0.3 to 3-Stop    Helps to Eliminate Reflections and Glare

• When used with a FotodioX WonderPana FreeArc Core Unit, a WonderPana 145 Core Unit, or a WonderPana FreeArc Aluminum Step-Up Ring, allows for the convenient use of two filters measuring 6.6" wide, or one filter measuring 6.6" wide along with one FotodioX 145mm round filter installed on a Core Unit or FreeArc Aluminum Step-Up Ring
• Provides two pairs of filter slots, a configuration that accommodates up to two 2.5 to 4.0mm-thick rectangular filters
• Allows up to two compatible rectangular filters to be rotated 360° when used with a FotodioX WonderPana FreeArc Core Unit or WonderPana FreeArc Aluminum Step-Up Ring
• When used with a WonderPana 145 Core Unit, allows up to two compatible rectangular filters to be installed in 45° increments so that a filter placed within it can be angled to the best approximate position relative to the subject in front of the camera
• Ability to vary grip on each installed rectangular filter to 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
• Lightweight, aluminum-alloy construction with a corrosion-resistant, black anodized finish for durability
• Rigid pouch included for storage and transport

Related Questions and Answers

Q: 1. Does this lens (FE 12-24) works well with Sony A7C?

A: Yes, it will be perfect for the a7C. It is designed for full frame mount cameras such as that one. The addition of the assignable button is also a welcome addition since the a7C has fewer buttons than some other Sony cameras.

Q: 2. Can't choose between the 12-24 and Zeiss 16-35mm. I like to shoot a little street, some indoor locations, some landscape, while once in a while a few close ups. Very little video. Seems like most people like the 16-35. Is it because it's more versatile? Anything I should know? Is the other one better?

A: Sony 16-35mm gives you a little les wide angle , but what most people like about it is that you can get filters for it easier and les expensive

Q: 3. 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: 4. will it be compatible with Lee filter systems? Because I plan to buy Lee filter system (Lee holder, adapter ring, ND 10 stop and Lee polarlizer,..)?

A: Last time I checked Lee didn't make a filter for this lens but they said they were working on it. NiSi does and it fits really well. That was about 4 months ago.

Q: 5. Do I need to buy another lens ring to fix this filter? This adapter is immediately attached to the lens or you need to buy something else? What is included with this filter?

A: What you see is in the photos is all you need if you want to use the polarizer. In the Box: FotodioX 186mm Slim Circular Polarizer Filter Filter Pouch Limited 2-Year Warranty FotodioX 186mm Center-Pinch Snap-On Lens Cap for Select WonderPana Systems & Filters Limited 2-Year Warranty WonderPana FreeArc XL Core Unit for Sigma 14-24mm f/2.8 DG HSM Art Lens Limited 2-Year Warranty If you want to use the square or rectangular filters, then you will need the brackets. Click on the link below to view; https://bhpho.to/32VgMWY

Q: 6. Is this lens compatible with the Sony A9 camera?

A: Yes, the FE 12-24mm f/4 G Lens is fully compatible with Sony a9

Q: 7. Does this work with the Sigma 14-24 mm lense that has the permanently attached hood?

A: Yeah this is made for that 14-24mm Sigma lens.

Q: 8. Will this lens work with the A 7R lll

A: This is a terrific lens and I use it whenever appropriate. For landscape, fine art, real estate, and other applications it is flawless. Very light, and as sharp as the GM lenses I own. Can't recommend it more highly. I use it a lot.

Q: 9. Is this rectilinear or a fisheye? How much distortion is there at 12 mm?

A: It is rectilinear. Distortion is minor all lengths.

Q: 10. Will this work on the new Sigma 12-24 Art?

A: It works well with the 11-24 canon so I can only assume that it will work with that lens. n Needs to be kept spotlessly clean so as to avoid flare abboration