NGC4501, an other field taken with LRS in white light with an integration time of 300 seconds. The PSF is 1.0 arcsec. Gunn r filter on a scientific field, with an average seeing of 0.46 arcsec. The detection limit of this image is about 25.5 mag, it is to be noticed that the CCD mounted in OIG is optimized for the blue spectral region. Color composite picture of planetary nebula NGC 40, shown on logarithmic scale, made with U,V and R OIG frames.
North is up, east is on the left.
Color picture of M57 ring nebula in Lyrae, made from B,V,R OIG frames. The exposure times are 40 sec. SN 1998ey in NGC 7080. SN 1999dk on the R Band with 60 sec of exposure. The image shows an example of first fringes and autocorrelograms of two classical examples of double stars.