Marty, You must be using an expensive set-up to achieve such fine resolution and contrast?
No sir, the reality is that the seeing is the most critical part of it all. One can induce contrast in post-processing. Otherwise, high contrast from the HA filter's properties can be a thing, but even inexpensive stuff can get there. Resolution however, regardless of what instruments used, is totally at the mercy of the quality of the atmospheric seeing. I find that in my area, early morning's are my only chance for higher resolution moments and even then I don't always get to the limits of my 8 inch scope, usually not at those limits ever, probably more like a 6 inch scope in reality just based on seeing quality not being top notch. My all-day-seeing quality can handle a 120mm aperture though, at any time of day, in HA at least, so that's my "seeing ceiling" so to speak, or safe go-to for imaging during the day when seeing isn't good enough for larger. I don't have a SolarScintillationMonoitor (SSM) yet, which would help a lot with triggering sessions based on seeing, maybe one day. But I'm fairly cheap so it may be a while!
Fine resolution starts to really show up in that 102~127mm range, even 80mm~90mm shows virtually everything quite nicely. So an inexpensive achromatic refractor and an HA filter of your choice, such as a Quark Chromosphere, gets you there affordably. But again seeing matters the most when it comes to resolution, so imaging during the day when seeing is the worst, or if local seeing is not good to begin with, etc, are all factors that can determine how big you might want to go to chase resolution. Honestly if I had to drop everything and have a single solar scope, it would be a double-stack 90mm~100mm, such as a Solarmax 90 III (which costs more than my setup!).
See above post for resolution examples with associated apertures.
Edited by MalVeauX, 19 November 2019 - 08:38 AM.