About Alignment errors and Preselector - after more trials I’m still finding that Preselector makes no difference at all to Mean and Median error (or any other Alignment report parameter).
Trying a set of 29 good photos in different scenarios:
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with Max features per mpx and Max features per image set very high so that features detected are well unrestricted:
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with ditto set at the Optimax that just barely leaves features unrestricted:
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with ditto set a bit lower, so that a slight top-cut is applied to features detected:
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with ditto set to drastically restrict featues detected:
In all these, whether Preselector is set at default 10k, very high at 100k, or reduced in 1k steps from 9k down to 1k, Mean and Median error changes not at all.
What does happen is that from 5k downward, getting all 29 photos almost always registered in one Component ends, deteriorating to 28, 27, then to multiple Components registering 2, 2, 3, 17, 2 photos.