The large Sunspot AR 2529 shows some interesting detail in the umbra and penumbra even in mediocre seeing.
http://www.astropix.com/Sunspot_AR2529_20160417.html
Click on the link to see a larger version with more information and a link to a video showing what the seeing looked like.
I recorded Live View video at 5x with BackYardEOS at about 20 frames per second out of a stock Canon 700D hooked up to my 5-inch refractor working with a Dakin Barlow at about f/21.5. This gave almost 2,800 millimeters of focal length.
This is a stack of the best 100 frames out of 10,000 total. Planetary Image Pre Processor (PIPP) was used to grade the frames and select the best 1000 frames for AutoStakkert!2 to stack. Photoshop CC 2016 was then used to crop the image slightly, adjust the levels, sharpen and add false color.
Jerry