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>square dust on sensor spots
Well, this is new. The super long Pringles can extension tube makes the square baffle in the Dream lens' 12mm Vivitar extension tube show up as bokah. It doesn't do that when I only use the lens and the 12mm e.tube. I don't consider this to be a good image, but wanted to share the square dust in the top left corner. It only showed up in the HDR version I was testing.