A lense question

[Seb]

Hello,

Here is as shot taken last week end with my Nikon D70 and Tamron 28-75mm XR Di lense.

48mm 13sec f/10 iso 250

There is nothing much to say about the picture itself but I have noticed some light reflection (flare? lack of coating?) arround the lamp posts on the bridge. Notice that in the center the light arround the lamp post appears to be normal. Moving to the left there is what I might call flare going on the left side of the light. The effect get stronger on the extreme left. The same thing appears (inverted) on the right side.

Is this usual or not?

Any comments/thougths are welcome

regards

Seb