Target acquisition

StanCam is used to image and center targets to be observed with FIES. Depending on the colour and faintness of the target, different filters or a clear filter can be used. For faint blue sources there is a bit of a problem. The Bessel B filter that is used largely overlaps with the cut-on of the glass used for the optics to re-image the fiber head on to the StanCam detector. For bright stars this combination gives an excellent attenuation, but for faint stars it is less optimal. To remedy this, a SDSS g-filter was tested and found to give better results. This filter is now added to the filter set that is permanently installed in StanCam.