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Your image scale will need to be around the same size as the seeing or greater. To be well sampled you want an image scale around 1/3 of the seeing, so for 3x3 drizzle your subpixels should be at least that scale.
I have some data from DSW in New Mexico from a Rokinon 135mm lens and KAF-8300 with an image scale of about 8.6 arcsec/pixel. It drizzles well at 2x2. I'll give it a go at 3x3 and report back.
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