A penta prism is a five-sided prism that deviates a beam by exactly 90°, without inverting or reversing the image. Unlike a right-angle prism, a penta prism keeps that 90° deviation constant even if the prism is slightly misaligned — which is exactly why it shows up in alignment and viewfinder optics....
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A right-angle prism is a triangular block with two legs at 90° to each other and a hypotenuse connecting them. It's one of the simplest and most widely used prisms, valued for its ability to fold or reverse a beam without the cost or fragility of a coated mirror. Key Specifications at...
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