Hi Ryan. Running a high ISO isn't usually ideal due to noise and loss of dynamic range etc, however, in this instance I wonder if it's worth briefly cranking up the ISO?
I'd suggest that you try capturing 30 subs at ISO 3200 (or 6400) and process those. If you can then see the Eagle, try backing off on the ISO, and increasing the subs until you're happy with the signal to noise ratio.
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