Yearofthegoat Posted April 25, 2017 Share Posted April 25, 2017 On my Celestron EOS t-ring, the inside of the bayonet connection is threaded - i.e. the camera side. Anyone know what this is for? It's about 48mm diameter, female, couldn't say what the pitch is but it's finer than the t-adapter thread. Filter holder maybe? Or to use some other Celestron doodad? Or just anti-reflection ribbing? Link to comment Share on other sites More sharing options...
Waldemar Posted April 25, 2017 Share Posted April 25, 2017 That cannot be a filterholder, because the bajonet would not fit the camera anymore if a filter was screwed in, so the only possible explanation is a light trap, I think. Link to comment Share on other sites More sharing options...
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