  We present high resolution Halpha rotation curves of 4 late-type dwarf
galaxies and 2 low surface brightness galaxies (LSB) for which accurate HI
rotation curves are available from the literature. Observations are carried out
at Telescopio Nazionale Galileo (TNG). For LSB F583-1 an innovative dispersing
element was used, the Volume Phase Holographic (VPH) with a dispersion of about
0.35 A/pxl. We find good agreement between the Halpha data and the HI
observations and conclude that the HI data for these galaxies suffer very
little from beam smearing. We show that the optical rotation curves of these
dark matter dominated galaxies are best fitted by the Burkert profile. In the
centers of galaxies, where the N-body simulations predict cuspy cores and fast
rising rotation curves, our data seem to be in better agreement with the
presence of soft cores.
