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Thanks folks! The camera used is actually a monochrome video camera that takes pictures at about 20fps. A freeware program called Registax evaluates and aligns each image and does some fancy pixel math when stacking them to get the sharpest image possible. Most of that process is fairly automatic.
The reason that a video camera is used is to combat thermal turbulence effects in the atmosphere ("seeing") that cause the view/image of the sun to ripple like its underwater. At a high frame-rate, the camera can capture those brief instants of clarity (when the air is stable) in individual frames over several thousand frames.
If I remember correctly for this image, I actually captured 2000 frames and used about half of them. Only about 3/4 of the Sun's disc actually fits on my sensor at this focal length, so I have to take about 2000 frames of the North hemisphere, and 2000 frames of the South, stack them, then stitch together to get the final image.
Like I said, its not the typical B&W image on this forum, so I hope it was OK to post here. I've been shooting some B&W film lately of more traditional, terrestrial subjects, so I hope to post some of those soon.