These pictures of the sun were taken with a Canon 600d using a 500mm lens and a home-made solar filter created with Baader Solar Safety Film for the construction of high-quality objective-filters designed for observing the sun with a camera.
This foil is CE-tested and reduces the intensity of sunlight by 99.999%. I was testing it out, ready for the 20th March solar eclipse.
Note top left the cold spots. Sunspot AR2297 has a 'delta-class' magnetic field that harbours energy for X-class solar flares.