In my experiments with the 2600mc I never needed (couldn't) to go over 200. The 1600 can go as high as 350 but it's no where near as sensitive (I think).
Ignoring the cores, I'm not sure but it might be the ST thing with the star mask not being quite right and then getting fluffy stars. I could never work it out. But they're tight as, and the detail is great for 2 hours.
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