A Discussion of the types of Matte Boxes for tric effects are lens shade produced by Bolex.
NiSi Cinema C5 Matte Box Starter Kit
Genustech Matte Box Lite Kit Review
The SHAPE 2-Stage 4 x 4 Matte Box accepts lenses with up to a 100 mm front outside diameter. It mounts to 15 mm LWS rods and utilizes a swing-away design, which lets you perform quick lens changes without having to remove the matte box from your rods. You can adjust the height of the matte box in relation to the rods, which comes in handy when your lens center to rod center height is slightly off from the standard. Two rotating filter stages support the use of 44 filters.
Shape Matte Box 4x4
Smallrig Mini Matte Box Lite (Works with Circular Filters)
NiSi Cinema C5 Matte Box Starter Kit
PROAIM MB-600 Camera Sunshade Matte Box
Wooden Camera Matteboxes
4 Reasons Why You Need a Matte Box for Your Next Shoot
Camera Cage Handle With Mini Matte Box Support For R7 Camera Cage Mirrorless Camera Fotografica Accessories Mini Lightweight - Camera Cage - AliExpress
Lighter and More Compact - Weighing Only 3.8 oz, SmallRig mini matte box 3575 fits small mirrorless or DSLR cameras, such as for Sony A7S III, for
SmallRig Mini Matte Box Lite, DSLR Matte Box with Carbon Fiber Top Flag, for 67mm/72mm/77mm/82mm/95mm Lenses, for 4x5.65 Filter/Circular Filter - 3575
4 Totally Different MATTE BOX Options
SmallRig Star-Trail System Matte Box Review - Camera Jabber
Shape Cage with Top Handle, 15mm Baseplate, Follow Focus & Matte Box for Sony a7S III
As one of the Star-Trail series matte boxes, SmallRig Multifunctional Modular Matte Box (Φ95mm) Basic Kit 3556 is designed for mirrorless cameras
SmallRig Multifunctional Modular Matte Box (Φ95mm) Basic Kit 3556
Tilta Matte Box review - good stuff from China? - Dan McComb