Experimenting with Double Filters

Yesterday morning I woke up at 5 a.m. It was dark, cold, and quiet — the kind of silence that makes you wonder if you should just crawl back into bed. But the sky was clear with some clouds forming near the horizon, and experience told me this could become one of those fiery sunrises worth losing sleep over.

So I packed my Canon 5DsR with the Sigma Art 24–70 mm and headed to the Loonse en Drunense Duinen. Besides chasing light, I had something else in mind — a little experiment. I wanted to see what would happen if I combined a polarizing filter with a transparent plastic petri dish (from Corning).

If you’ve ever looked at a car’s rear window through polarized sunglasses and seen those oily rainbow patterns — that’s birefringence at work. When two polarizing surfaces interact with certain plastics, they reveal hidden stress patterns in vivid colors.

So I rotated both filters until the sky exploded into gradients of purple, turquoise, and gold. No Photoshop tricks here — just light, plastic, and curiosity playing together.

Sometimes, science and art meet right in front of your lens.

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