I have a couple of similar lenses but not exactly what you're asking about. I have the Tokina SD 400mm f5.6, a bit newer than the RMC version, maybe better too, but stil some PF. I bought a Vivitar 500mm f8 mirror lens, made in Korea, used to be fairly common. The Vivitar was OK for the price, but contrast was very low and sharpness was mediocre. It came with a 2x TC which didn't help. I can get just about the same results by cropping an image from the Tokina. I kept the Vivitar because it's way more portable than the Tokina.
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