Ou 4 - L from RGB (DSLR) invertedOu 4 and Sharpless 129 - RGB and OIII + Hα

Ou 4 - inverted luminance from RGB (DSLR)

Only the brightest parts of Ou 4 become visible on the inverted and contrast-enhanced DSLR Image.

Ou 4 - inverted luminance from RGB (DSLR)