The FotodioX WonderPana 6.6" Holder Bracket is 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 Canon TS-E 17mm f/4L    WonderPana FreeArc Core Unit, Lens Cap    WonderPana 6.6" Holder Bracket    145mm Solid Neutral Density 3.0 Filter    1000x Filter Factor, 10-Stop    Darkens Entire Image    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

• 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. Can one stack the system on a circular filter attached to your lens without vignetting?

A: Well, yes and no. On my Canon 16-35, I experienced vignetting at 16mm. But none at 18mm and beyond.. On my Zeiss Milvus 21 mm No vignetting noticed. So for me not such a big deal. But what is a major issue, and I believe Lee has recognized this by producing a lens hood of sorts is the terrible flare and reflections when the sun is overhead. In this type of light, the filter kit is unusable. So if you do decide to purchase the filter kit and landscape polarizer and adapter ring definitely also purchase the lens hood or filter cover or whatever it is. Cause you are gonna need it. For Sure.

Q: 2. Hello, I am looking at this holder. I currently use the Conkin Z series with the Canon 16-35 f2.8 on a Mkiii, which is a 82mm thread. With the conkin I'm having issues with see the side of the holder from 16 to about 20-21mm. Will this holder alleviate that issue allowing me to shoot at 16mm without issue?

A: I'm using it with a Nikon 16-35mm lens with a 77mm thread and have no issues with vignetting at 16mm.

Q: 3. Is it possible to adapt or configure to hold smaller width filters such as the Cokin 84mm wide p filters? If so, how?

A: Unfortunately, we will only have adapters that allow for using a larger 4x4/4x6 filter with a Cokin P holder, and not the only way around. To do so, would cause a major vignette , especially with wider angle lenses.

Q: 4. Can everything in the kit fit in the storage pouch?

A: Yes the whole kit fits into the pouch.

Q: 5. What's the difference between this kit and the very similar #KW-MGKITPROC-82 (https://www.bhphotovideo.com/c/product/1533019-REG/kase_kw_mgkitproc_82_82mm_pro_kit.html/qa)?

A: The more expensive kit comes with a stack cap instead of just a lens cap. Which consists of a front and rear cap.

Q: 6. Does it come with extra guides to add two filters or do you have to purchase more?

A: Unfortunately it does not. can only hold one filter

Q: 7. Will this holder accommodate my Lucroit 100mm filters?

A: I use 4x6( 100x150) Singh Ray filters.No problems

Q: 8. Can this fit a 3 mm thick filter that is 101 mm x 143 mm?

A: No, it just fit, except you cut the filter.

Q: 9. How does this differ from the Kase 77mm Wolverine Magnetic Professional Neutral Density Filter Kit II (BH #KAMGKITPRC77 MFR #KW-MGKITPROC-77)?

A: The Kase Wolverine Stack Kit (KAMGKITSC77) comes with the rear-filter cap that enables a more streamlined system for storing and carrying your filters, with the caps at the top and bottom of the stack. The other kit you have linked only comes with a front lens cap.

Q: 10. Has anyone used this 82mm Kase KW-MGKITSC-82 system with the Canon RF 15-35mm Lens and if so have you experienced any lens vignetting?

A: These filters are fairly thin and you can stack quite a few of them. At the widest 15mm part of the zoom range you can stack 2 maybe 3 filters. But once you start zooming in a little you can stack more.