Hα luminosity function of the Virgo cluster corrected for [NII] contamination and dust attenuation (filled black dots) and its Schechter parametrisation (solid black lines) compared to those derived for field galaxies in the local Universe (z ≲ 0.16, dashed curves; left panel) and star-forming galaxies in nearby clusters (Coma and A1367, from Iglesias-Páramo et al. 2002 and a sample of clusters at 0.15 < z < 0.3 by Stroe et al. 2017; right panel). All luminosity functions are normalised to the number of galaxies within the Virgo cluster sample in the bin centred at L(Hα)_cor = 10⁴¹ erg s⁻¹. The vertical dotted and dashed black lines indicate the expected Hα luminosity for a single O3 and B0 star, respectively.