vikkyvik wrote:Those looks quite irregular. Airport grooves (and road grooves) that I've seen are much neater and well defined.
Braybuddy wrote:Would a thin layer of rainwater be that opaque that the grooves could not be clearly seen?
Braybuddy wrote:And isn't it strange that the effect they produce is . . . exactly the same as you wouild get with a radial filter?
vikkyvik wrote:At a very low angle? Yes, it would.
Braybuddy wrote:I haven't used one of those filters, so I couldn't say.
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