[OM] is this distortion? what kind?

[Acer V]

i was looking at some old pix, and came across this one with the
28/3.5. note lower step, it seems to be concave down (sorry no idea what
to call it) while the upper step is level all the way across. is this WA
distortion at the edge? what is is called? thanks, 

http://albums.photopoint.com/j/View?u=380427&a=9125406&p=31108137&Sequence=0&res=high

/Acer V
--
dum spiro, spero
http://student.ucr.edu/~siddim01


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