Previously, I have achieved good results in H-Alpha high-resolution solar imaging with a PST etalon-D-ERF on a C11. After 3 months of tinkering, I finally succeeded using a Daystar Quark with the same D-ERF- C11 setup. This is the setup:
The Sun is quiet today. Nevertheless, when you peer in, you can see many fibrils in an interesting landscape. The width image is about 240 arc sec (about 1/8th of the diameter of the Sun):
This configuration looks promising and I look forward to using this setup for high-resolution solar imaging with a Daystar Quark for Solar Cycle 25.
Alfred