WFC3/IR Filter Wedge

Abstract. In order to verify if any of the WFC3/IR imaging filters presents variations in its thickness (filter wedge) we observed the young and bright star cluster NGC 1850 through all the WFC3/IR filters consecutively within 1 orbit. We found that, with the exception of the F098M and F126N filters, the positions of stars observed though different filters differ on average by less than 0.14 ± 0.06 pixels.