The density of the silver layer is critical. Even where the prism hasn't come apart, sometimes the beamsplitter may have deteriorated, in which case we still go through the same procedure. Its purpose is to mix the image from the small rangefinder window ( the RF patch) and the framelines along the axis of the main viewfinder image. The beamsplitter is a semi-reflective layer of silver applied to the hypotenuse of the prism, closest to the eyepiece. Once the beamsplitter prism has been polished and cleaned, it is ready for the beamsplitter to be applied. ![]() The chips were very small but deep, we decided not to grind down the surface because this could result in a loss of optical performance plus they were very small and wouldn't be in any plane of focus when in use. ![]() On this particular job, we found three tiny chips on the hypotenuse of the prism that holds the beamsplitter.
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