inside story
Nice eyepiece. One odd fact; mine was used with some minor dirt inside. I took it to a camera shop, he dismantled and cleaned it, and commented about the good build quality. He did mention that only the last lens group (#4) had the lens edges blackened, the upper three groups did not. It could be blackening is not important on these, but the guy said in good camera lenses the edges are ALWAYS blackened.