Telescope:   Obsession

Mirror:         25" f/5 Galaxy Optics

Drive:           AZ/ALT, StellarCAT ServoCAT with DSC Argo Navis

Camera Equipment:   ST-10XME Class 2 CCD, AO-7, Pyxis Field De-Rotator, TCF-S

Field Rotation Rate:   Approximately -13 degrees/hour.

Exposure:    Single 30 minute.

Processing:   CCDOPs (hot pixel repair, cold pixel repair, dark subtract, flat), Photoshop 5.0 (Levels)

Location:   My backyard in Ridgecrest, CA (Mojave Desert), 2600 ft. elevation, population 30,000

Date:         5/31//05

Comments:   Looking north into skyglow.   Forgot to set the filter to clear. Later, while imaging M109, I realized my mistake and found that imaging was much brighter once the filter had been moved to clear.   The .fit header only indicates "NONE" for the filter.   Once the filter was moved, the .fit header indicated "CLEAR" for the filter.   Image would probably have been much brighter in much shorter time if the clear filter had been used.