Daystar, Baader ERF, FSQ-85, www.astroholgi.de custom parts
The "Daystar Chromosphere" eyepiece on the FSQ-85 telescope. It converts your refractor to a Ha telescope for small price. You need an excellent eyepiece for this configuration, Takahashi, Televue or Pentax provide suitable eyepieces in the 40-15mm range. Note, the Daystar has a 4.2x telecentric (i.e. it's like a barlow lens) inside.