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Hey Lester, Bird has an answer. I have tried this and it seems to work really well.
I found that you can choose your alignment points and then get the FFT filter up. If you then click on alignment grid numbers where it lists all the alignment points. I found that the FFT went to 30...i then changed it to 9 and then i never got any seams at all.
i have tried it a few times and no seams. i even forgot to stack with feather turned on .. no seam
I even stacked different amounts in the stacking
--birds advice------------
As for working around the "features" in registax, here's a tip - after you've set your align points go to the "general options" -> "fft graph"
dialog and change the fft size from whatever registax has chosen (which is almost always completely wrong) to something sensible like 9 or 10.
The fft size sets some "blurring" to be done on the images before it tries to align them (but only during the align phase, not when stacking). This blurring removes noise and the idea is that the algorithm can do a better job if this value is set accurately. But, for reasons known only to Cor, it picks lousy default values. Larger values mean *less* blurring and so the align box is distracted by noise. I find the default value it picks is something like 20 or 30, way to large. Try
9 and see what happens.
watch the align box during the alignment phase, if it wanders around too much then the value is either too small (too much blurring) or too large (too much noise, cant see the details).
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