In December of 2009 I purchased a Lunt LS60THa DS50.
The LS60THa is a complete Solar Telescope. It is a 60mm refractor-based system that has a precision aligned singlet chromatical lens. The focal length is 500mm providing a ~4.5 mm image thru a 6 mm blocking filter. Fine adjustment is achieved with a Crayford style focuser with a 10:1 reduction. An internal etalon with tune adjustment allows for a <0.8
 Angstrom bandpass.
The addition of the second 50mm Etalon gives you a <0.5 Angstrom bandpass. The Second etalon is usually used to bring out the surface details. I find that I tend to use the scope without the second etalon. This gives both excellent surface detail and high contrast prominences. Adding the second etalon, seems to bring out more surface detail, but it is a subtle difference. I will need to experiment more.