The difference between SLR pentaprism and pentaprism lies in the material and reflection.

1, five-sided mirror: specular reflection is used, and the specular reflection is silver-plated, so there must be light loss.

2. Pentprism: It is made of a whole piece of solid glass by cutting and polishing, and then the outer surface (except the two surfaces connected with the focusing screen and the viewfinder eyepiece) is coated with reflective materials to form specular reflection inside.

Second, the characteristics are different.

1, pentagonal mirror: The advantage of pentagonal mirror as the viewfinder of SLR cameras is that it is beneficial to reduce the weight of the camera and the cost is lower than that of pentaprism, so it is sometimes used in some public SLR cameras.

2. Pentagonal prism: It is a reflection device for SLR camera framing, and its function is to correct the left and right inverted images on the focusing screen, so that the images seen by framing are completely consistent with the direction of the scene directly seen, so that the operator can correctly frame and focus.

Third, reflect the differences.

1. Pentagonal mirror: Pentagonal mirror can only reach 80% brightness of pentaprism.

2, pentaprism: total reflection without light loss. So the pentaprism must be brighter than the pentaprism.

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