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This all in one method of sun imaging also provides the easiest Schlieren photography
in the world. The mirror acts as a 30,000 mm telescope imaging the sun. The longer the
distance a mirror is from screen or wall, the longer the focal length.
Alternate DIY Schlieren Photography Method
Schlieren (from German; singular "Schliere", meaning "streak") are optical inhomogeneities in transparent
material not necessarily visible to the human eye. Schlieren physics developed out of the need to produce
high-quality lenses devoid of these inhomogeneities. These inhomogeneities are localized differences in optical
path length that cause light deviation. This light deviation can produce localized brightening, darkening, or
even color changes in an image, depending on which way the ray deviates.
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