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Ok, from my understanding of this box, it sets the feature size that registax will use in your images for its alignment. If you make this number smaller then registax will use larger features in your image and vice versa.
The central red dot gives you a clue as to what feature size it's set for, as you make the numbers bigger this red dot gets smaller.
You can assume that the fft filter will blur your frames (only a copy of the frames, not the real ones) so that features smaller than this red dot are blurred out and not used for alignment.
The correct value of this box depends on your individual data - ie how large the usable features are in your images and how much noise (small scale random features) you have.
You can set it by trial and error - start with a small number like 5 or 6, and then watch the alignment boxes as registax goes through its align phase - if the boxes seem to be moving and tracking on the features ok then you're good. If the alignment boxes seem to be jumping around too much then this number is too big and it's locking onto random noise. If the alignment boxes are not moving enough (or not moving at all) then the value is too small and registax is ignoring the smaller features completely.
My experience is that registax almost always chooses a bad value for this box, I always have to open and reset it to something suitable for my data.
cheers, Bird
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