Oil (probably from the last days of the old compressor) was removed from the dewar window by Don Walter at the end of May. This has eliminated the curious-looking ‘coffee stain’ present on recent images.

The above unreduced image of Zw229-015 gives a fair idea of current image quality.

Current resolution with 2×2 binning (0.58 arcsec/pixel) is shown in this image of Eps Boo taken through the U filter. Separation is 2.85 arcsec.