I am selling my ST2000XM with a CFW8. It has the newer KAI2001 chip which has more sensitivity. It has the smaller TC211 guiding chip. The CFW8 has the SBIG/CS standard filter set. I have taken many images with this camera and so I know it works well. I am selling because I am now using the ST11k primarily. Asking price for both is $3100 and is $890 less than new price (including the SBIG $500 discount). However, the new ST2000XM has the larger TC237 guiding chip.