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Reliable fundamental parameters of open clusters such as distance, age andextinction are key to our understanding of Galactic structure and stellarevolution. In this work we use {\it Gaia} DR2 to investigate 45 open clusterslisted in the \emph{New catalogue of optically visible open clusters andcandidates} (DAML) but with no previous astrometric membership estimation basedon {\it Gaia} DR2. In the process of selecting targets for this study we foundthat some clusters reported as new discoveries in recent papers based on {\itGaia} DR2 were already known clusters listed in DAML. Cluster memberships weredetermined using a maximum likelihood method applied to {\it Gaia} DR2astrometry. This has allowed us to estimate mean proper motions and meanparallaxes for all investigated clusters. Mean radial velocities were alsodetermined for 12 clusters, 7 of which had no previous published values. Wehave improved our isochrone fitting code to account for interstellar extinctionusing an updated extinction polynomial for the {\it Gaia} DR2 photometricband-passes and the Galactic abundance gradient as a prior for metallicity. Theupdated procedure was validated with a sample of clusters with high quality$[Fe/H]$ determinations. We then did a critical review of the literature andverified that our cluster parameter determinations represent a substantialimprovement over previous values.

Fundamental parameters for 45 open clusters with Gaia DR2, an improved extinction correction and a metallicity gradient prior