Larry's words...
http://www.petapixel.com/2012/02/14/beware-light-painting-with-steel-wool-can-be-hazardous-to-your-lens-health/
--
Larry Colen LRC at red4est.com (from dos4est)
While it looks out of favor, another possible source of lens damage is
plain, old fireworks.
Even if one's in a zone apparently safe, sudden gusts of wind may land
more than smoke in lens, eyes or clothing. While the damage presented to
the lens on the link is rather extreme, even smaller coating damages may
degrade quality and are easily prevented by a lens filter.
I'd add a lens shade myself - they cut down filter/ front element dirt
and saltspray for those near the sea, cut down flare, and protect filter
threads from dings in case something bigger than sparks hit the lens.
...of course if it's big and fast enough there are other issues than
gear damage.
--
luiz felipe
luiz.felipe at luizfelipe.fot.br
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