Yearofthegoat Posted April 25, 2017 Share Posted April 25, 2017 (edited) 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? Edited April 25, 2017 by Yearofthegoat 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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