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Hi Gavin,
With the Helix taking up a small portion of the full frame I wouldn't bother with flats unless you have heaps of dust bunnies. Crop out the wasted black space when post processing.
This last 12 months I have not done any flats and rely on the Startools Wipe module to fix up the vignetting and gradients (I keep the optics clean so I have no dust bunnies).
Cheers
Bill
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