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Hi Mark, try dropping your ISO, most DSLRs seem to have an ISO 800-1600 sweet spot.
Since Carinae is a bright object, and you are using an f5.8 scope with 2min exposures, you could probably use ISO 800.
This might help stop stars overexposing (and losing their color).
Also, when stretching the histogram, you could try mask the stars so they dont get brighter and larger.
A combination of these should help the abundance of stars, and in turn, help the nebula pop out a bit better.
You caught some fantastic, bright color in the nebula, well done
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