Why do some cameras have to square matte box?

  Nearly every camera lens comes with a round or square, or petal-shaped matte box. And different matte box length of the lens is not one.
  Sometimes, you find it troublesome, simply throw them at home.

  First, they are useless in the end?
  In everyday life, when we encounter very intense sunlight, we cover the eyes with our hands above our eyes, blocking the reverse sunlight and letting the light of the front scenery into our eyes, so that we can see clearly.

  Wearing a matte box lens, like with our hands covered in the eyes above.

  The picture below is matte box backlit photo effect:

  Matte Box SK-MB1
  The Sevenoak SK-MB1 DSLR Matte Box with Top Flags for 15mm Rods from Sevenoak is suitable for use with a wide variety of DSLR cameras and baseplates with 15mm rod system(cameras, baseplates, and rods are not included). It is constructed from high-grade ABS plastic, and the included flag is made from aluminum. It is used on the end of a lens to block the sun or other unexpected light source during shooting.
  Simple and lightweight;
  Foldable and removable French flag;
  Fits for industry standard 15mm supporting rods;
  Universal anti-reflection fabric donut;
  Adaptable to various lens sizes;
  Compatible with other accessories;
  High-grade ABS plastic and Aluminum construction;

sevenoak camera matte box
The matte box is also a feature for camera lenses - blocking unwanted light. In backlit, side light photography, matte box to prevent the non-imaging light to enter, to avoid haze; in the light and side light photography, to avoid the surrounding scattered light into the lens; in light photography or night photography, you can avoid surrounding The interference light enters the lens. Matte box wall flocking, but also to prevent the light in the matte box wall reflection. So, the camera is equipped with a photo taken by a matte box, generally with richer colors and deeper saturation.
  Why do some cameras have to use a square matte box?
  You may find that square matte boxes are mostly equipped with camera lenses that are more expensive like the Lycra. Or, on the TV, movie camera lens. Are they playing cool?

  This is because the images we view from the viewfinder of the paraxial camera do not come from the camera but from a viewfinder above the left (or right) top of the camera. If you use a round matte box, the matte box will be part of the viewfinder blocking part of the line of sight, and affect the observation.

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