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Thanks Greg!
I certainly do focus with each filter change. My Baaders do seem pretty close to parfocal. The whole issue came to light when I just couldn't find a focus in blue that looked anywhere near what the FWHM values indicate. In other words FWHM of say 2 but looks terrible on the actual image.
Yes, perhaps I could switch cameras on the scopes but I would lose the fairly lucky nearly same FOV and similar resolution I get with the cameras set up this way. Also, with the sensitive Trius gathering colour I think it's a win win situation. Once I get the blue tamed I should really be good to go. The resolution of the 8300 chip on the TEC180 is great!
Peter
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