I'm building from github master. I had switched to the colorChannels branch for a while, but the last one was master agai, after you had announced you integrated it there (commit 9d4efa44a01)
And StellarSolverTester (built together with the rest) does show the channel selector.

I'l keep experimenting, but maybe I should put the OSC on a better optics. I'm still not convinced it's not the lens that is producing part of the issue, as the star images do have weird halo/wings that might irritate the routines.

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