If I make a section with the marquee tool, and then Select > feather 100 px, I get a smooth rectangular gradient.
If I use the same Marquee selection, preceded by feathering in the Options Bar, I get an oval selection reflecting the feathering.
I observe the feathering by creating a layer mask, or by dragging the selected Layer into another document.
Why is the feathering different?
Thanks very much,
Mac 10.7.5, PSCS6
BTW, I was doing this little experiment on a Background Layer.