>>4287760I just started taking solar pictures recently, but I've been taking moon pictures for years. A lot of what I learned applied over. Solid tripod, image stabilization turned off, live view zoomed in all the way and manual focus, and a 10 second shutter delay to eliminate camera shake.
On that shot, I was at f/6.3 (wide open), 400mm lens, 1/500 shutter speed, and ISO 100. At that magnification, you need as fast a shutter speed as possible, since the sun will visibly move across the screen.
And, of course, shooting in RAW and doing normal corrections in Lightroom.