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The only thing which is being discussed (on other forums) with solar "tuned" optics is the compensation of possible spherical aberrations between the objective and the internal collimating lens immediately prior to the etalon.
This discussion only applies to Ha scope designs using smaller internal etalons i.e. PST/ Lunt60 and above/ SolarmaxII series, for the others with external etalons a good achromat/ ED/ APO will work very well in the monochromatic Ha wavelength.
I haven't used a Lunt60, so I can't compare, but based on numerous PST mods and being a regular SM60 user, I'm surprised to hear you think it's better than the SM60 external etalon.
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