last thursday Al Meehan and I imaged the same area of sky, whilest the orientation of the camera was not the same he got a heap of deep 10min shots and i got a mixed bag of shots , well when they are all combined in DSS and stacked this is the RAW result not stretched or level adjusted (saved from tiff to jpeg for display
) collaberation!!!??? yes its worth it! total stacked image time is 5h 7min plus a few seconds. Both have cooled 40D's, both use CLS filter, note the image is not been processed yet