The 20DA is an awesome camera and I will definetly miss the live focus mode but it still is 2.5x the H-alpha respone then a standard DSLR, a full mod camera is close to 6 times but I am still not sure atm.
Maybe a dedicated CCD but it is looking like the 5D sensor will be wasted on a SCT.....I need to confirm this as it's a huge difference in price and one I am not going to take if I cant use the full image scale.
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