I suppose the question would be if there is any gain to be had from it. In the case of the ASI2600 I decided it was marginal enough improvement going from -10 to -15 that I would just stick to -10.
I just shot 50 X 900 second darks for mine. A recent test showed that the camera would respond well to 900 second exposures so I better get ready to use them! Handy for really dark stuff or if I put a HA filter in the train.
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