Threads are clean and parts glide smoothly when screwing/unscrewing. black anodized finish is uniform and fully coated. Baader Planetarium MPCC Mark III has slight resistance in threads when attaching extension tubes, but it works.The only suggestion for improvement, or an upgraded version, would be a matte finish on the inner surfaces. I doubt it would make a huge difference as the threads already break up the reflections quite a bit. I suppose one could coat the inside with matte black Krylon and perform a contrast comparison, but I'll leave that as an exercise for another reviewer.
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