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ZWO only mention "IR cut" for their stand alone filter, but when you look at the transmission curve it is obviously a UV-IR cut, it might as well be sold as a lum filter. I would expect that the window on the 2600MC would be the same. I have never seen any oddball reflections with the 2600MC that I used to get from the 294MC, which only had an AR coated window, they were resolved by putting the "IR cut" filter in the train.
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