I think several things could cause this cast.
It may just be as simple as light refraction due to the angle the suns light was hitting your front element.
It may be the in camera settings you have set in your menu if you shot in jpg.
It could be, as Casil suggests, a product of post processing via Topaz or even HDR Merge.
Your lens might have been up late last night on a bender and is feeling a bit bloodshot.
The lizards might have done it.
Maybe there is no cast and we are just playing with you.
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