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I first saw a Ha Sun through a Coronado SolarMax 60. I liked it so much I got my own but could only afford the Coronado SolarMax 40 (pre-Meade). This is a step above the PST since the bandwidth is narrower and the focuser is better. However it is still 40mm.
The larger aperture of a 60 mm Ha ‘scope would give, a 2.25x brighter image than the a 40mm and would be the logical step up but at added cost. Image brightness is perhaps more important if you want to observe the surface and especially if you are double stacking. Narrower bandwidth too helps with contrast on the surface.
If I were to upgrade from 40mm I would go to straight to 80mm but this is at considerable more cost and at present I am satisfied with what I can see with the Coronado SolarMax 40mm. I have never looked through a Lunt Ha Telescope.
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