A small but nonetheless vital, not to mention expensive, element (*cough* 🙂 of my stage 2 PST mod has now arrived — a 75mm Baader D-ERF that I plan to fit inside my Evostar 100. The filter arrived in a neat little box, heavily wrapped in bubble wrap and inside a ziplock bag wrapped in tissue paper:
A handy label reminds me which what the filter should be fitted:
And here’s the entire thing complete with etching on the edge with the arrow that is supposed to point towards the Sun:
The next step is to make a cell for it that holds the filter in a suitable place in the OTA whilst giving the filter a small tilt to help prevent internal reflections.