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Got pic related recently for cheap. I briefly had a Centon 500mm mirror lens years ago and hoped the newer Samyang would be better. Turns out it is the exact same lens.
I suppose back in the day, with fast film at an airshow you could get passable 6x4 prints. In 1993+25 it's pretty much useless.
I've turned it into a small low power spotting 'scope (no epoxy yet). I've found the surfaces that are effecting contrast and plan to blacken/flock these. The only positives so far is that the edges are quite sharp with a low power eyepiece and the build quality.
tl;dr Don't, even for shits and giggles.
