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Both have the same sensor size, the 7D tho is likely to be higher spec.
The 60D's flip-out rotatable screen is great for astro work, which saves you contorting while trying to see what the focus is like or when going thru the menu. This is obviously a moot point if you use Backyard EOS or similar cam control software.
The 60Da has the flip screen too, but also has extended red response for Ha AP.
Based on Canons advertising, I suspect the 60Da may have the same low noise sensor that the 7D has, but I have no way of proving that, short of voiding my warranty and opening my Da and someone's 7D to look at the sensor model numbers.
I am also surprised how well the daylight shots are with the Da, very rarely see over-red in images, tho sometimes black shirts will appear red, I assume due to the red die used. This can ofcourse be corrected with a filter.
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