NancyP: I don't know much about astrophotography, but the samples on Canon's Japanese website do show a definite increase in red sensitivity. It would seem that the sensor bandpass filter change is the main improvement in the camera body. The rest seems to be bundled "essentials" allowing long exposure with mirror lock-up, easy astro-stacking protocol (I forget what this is called in astrophotography - immunofluorescence microscopy uses the same averaging technique to cut noise). Have fun folks! The closest that I have come to astrophotography is the ever-popular super-tele moon shot.
Donald:Would like to know how can I change the movie produced by the 60Da to an avi stream, so i can use some astronomy stacking software such as RegiStax.Regards,Eric (México)