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No worries
yep, each filter has a thread in front so other 2 inch filters can be scrwed on top, it doesnt really matter what filter goes where, though as the UHC-S is fairly reflective, I put it in front so the rejected light gets reflected away. Also, dedicated astro cameras with inbuilt IR filters have them closest to the imaging sensor.
I have a old 1.25 inch Lumicon o3 filter, and tried it once on the helix nebula, the centre parts came out a green colour, rather then the more normal blue, if it was a 2 inch filter Id use it more.
Scott
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