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I have a 60mm Lunt with the double stack add on. I find the tuning quite tricky, and honestly have not mastered it yet.
If the blue filter is not your issue, remove the double stack section and use it as a single stack version for a while. You will find it is much easier to get even illumination. Once you regain some confidence in the scope set replace the double stack when you have a good single stack image, and then experiment with the double stack tuner and see what affects you get.
I'm thinking that they need to be tuned to almost the same pass and with just a slight offset. I'm thinking that they way they achieve the narrow pass and can generate artifacts which can interfere and cause the poroblems you describe. I'm thinking it's almost impossible to get a full frame double stacked image evenly illuminated and suitable for imaging. Ok for visual, as you can look at different parts, but the camera is unforgiving.
I'm awaiting a replacement blue filter for my system also, but that's not the cause of the uneven illuminations.
Cheers Briab
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