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The first full HD cameras were used for ST02, as visible in the WOWOW special. ST02 mixed full-HD cameras with SD cameras, it looked awkward as hell. From AT05 on everything was shot in HD(with apparently some SD cameras mixed in?). They were not upscales, they were true HD. Just shot on worse cameras than AT10 and newer concerts. (CT00, DT01, AT02 and possible AT0304 were shot using only SD cameras)
Why AT07 wasn't released on Bluray...I'm guessing it's the formating.
They MAY have not brought the HD cameras overseas though because such cameras tend to be bulkier and heavier than SD ones.
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