Not sure H, I have always used Dark Flats although on the 60Da I haven't. There was quite a lot of posts on the group concerning Dark Flats and Mike Unsold was adamant that on exposures under a second or so there was no need for them, I learned under the really old system and still take Bias, Darks, Dark Flats and Flats.
Will give the not taking of Dark Flats and Bias a go next time out with the 60Da.
Cheers
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