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Perhaps I should elaborate a little. I did film astro for over 40 yrs before attempting the move to digital, and therefore am familiar with C.A. and
coma etc: etc: I was expecting some C.A. in these first images as I had
the lens wide open, but was shocked by the amount- far more than my
Tamron 18-200mm exhibits at any f number. Every review of this lens
that I have read [5] states that the C.A. of this lens is minimal, better
even than the f1.4 version [for terrestrial use, of course]. I was also expecting, and got, the coma.
I guess what I am really asking is whether dropping the lens could
dislodge any of the glass causing C.A. or whether in this digital world that I now inhabit, there could be any other reason for it.
The lens is the 50mm EF 11[plastic], and doesn't have a focusing distance scale, so I couldn't use infinity even if I were silly enough to
want to Pat. My focusing ring has some resistance, so stays where you put it quite well.
Thanks people
raymo
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