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Hi Leon
I used to fit protective UV Filters to all my lenses until I took a wide field view of the Milky Way with Jupiter with my Canon 400mm F5.6L lens and discovered multiple shocking reflections from the bright planet. I used to purchase expensive "Professional" grade filters, not cheap ones.
I figured that whilst this was an extreme case, even so, it would mean that there is still an effect with normal terrestrial scenes, so I ditched all my filters.
I always have a lens hood fitted to protect the front element from coming into physical contact with an object when I am using or carrying the camera.
Cheers
Dennis
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