Just reading the current Meade marketing blurb
https://www.meade.com/coronado-perso...scope-pst.html
""Features a 40mm diameter dedicated Ha optical system with 30mm internal etalon primary blocking filter""
What rubbish!!!
The etalon assembly is restricted to a 20mm aperture. Always has been.
It's like the Ad for their latest 70mm SolarMax III telescope - which is fitted with a 60mm external etalon!!!!
I can only think they hope to impress the unwary and look better than Lunt???