... dark skies): Verry good, huge contrast enhancement at O III-emission nebulasVisual observation (urban skies): Verry good, huge ... contrast enhancement at O III-emission nebulasFilm photography: It depends, very long exposure timeDSLR ... photography (original): Verry good, huge contrast enhancement at O III-emission nebulasDSLR photography (astro modified): Verry good, huge ...