I don't know anything about the Ks2, but the Canons I have/had don't
have the dark function in isolation, only as part of noise reduction.
It is a good idea[ with Canons anyway] to put noise reduction on standard,
not strong, as strong can affect image quality.
F/8 is very slow, so you will have to increase sub length and ISO to obtain
worthwhile results.
raymo
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