Object: M51 - Galaxy in Canes Venatici, "The Whirlpool" Date: April 24, 2001 - 23:37 UT Scope: Vixen R200SS - 8 inch f/4 Newtonian at direct focus Camera: SBIG ST237 Detail: L = 3600 no binning, R=G=B=1170 sec each binning 2x2 all Track&Accumulate in 90 sec. increments (L flat fielded). Guided with ST237 Cpu which corrected the mount relays every 90 secs. Images processed with CCDOPS for Windows 4.10 and AIP4WIN Further processing performed with Picture Window Pro 3.1 Notes: Seeing medium