Common ghost images result from internal reflections in the filters and in the field-flatteners. Two filter ghosts, caused by double (and quadruple) reflection inside the filter, are visible below and to the right of the star in Figure 5.13 . ... An additional ghost is caused by an internal reflection inside the MgF 2 field flattener lens immediately in front of each CCD ( Figure 5.14 ). ... Figure 5.14: Saturated Stellar Image Showing Field Flattener Ghost on WF2. ...
ST-ECF Instrument Science Report WFC3-2005-07 Ground tests of the WFC3 NIR grisms S. S. Larsen, H. Bushouse, J. R. Walsh March 2005 ABSTRACT The fundamental parameters of a slitless dispersing element are the geometrical configuration of the spectral orders, the dispersion relation relating pixel offset to wavelength and the sensitivity of each order. Based on thermal vacuum tests, the performance of the WFC3 near-IR G102 and G141 grisms has been assessed. ... WFC3 IR Grism Modeling and Rotations. ...
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