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Hi Steve,
If i'm reading this correctly you are imaging through 2 filters for colour ie. R + UV/IR and through one (only UV/IR) for Lum. This will cause a different focus position for colour vs Lum. I have the IR filter that came with the LRGB filter set in the fourth filter wheel position so the Lum image is through a UV/IR mounted on the front of the DSI and an IR in the wheel. This way the whole lot remains parfocal.
Are you using the Baader LRGB set? If so then what you need is a second UV/IR filter. Hope this helps,
edit - looks like Meade filters in the picture - the Meade filter set that comes with the DSI pro normally has IR, R, G, B. In this case put the four Meade filters in the wheel and the Baader UV/IR on the nosepiece.
Peter
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