Swap a third-party C-mount lens onto a Samsung Galaxy Tab 3 sensor and every shot comes back with a persistent pink cast, stronger at the edges, nearly absent at the center. This is not an isolated quirk. A recently featured Hackaday iPhone lens-swap project showed the same artifact. The stock lens produces no such tint. Something specific to the sensor-plus-aftermarket-lens combination is the cause.
The author stripped a replacement Galaxy Tab 3 camera module from AliExpress, removed its lens assembly, built a 3D-printed adjustable C-mount adapter, and attached a quality Fuji C-mount lens designed for 8mm film and vacuum-tube TV cameras. An IR-cut filter was glued directly over the bare sensor. The pink cast remained. The filter may be passing residual IR, or the problem originates elsewhere, possibly in the optical path or the sensor's microlens array geometry, which is tuned for the tight chief ray angle of the original lens.
The article does not resolve the problem. That is the point. It is an open call to readers with optics expertise, and the comment thread is where the real value is. Read the full piece for the exact hardware configuration and the side-by-side image showing the radial color gradient, details that matter if you have ever seen this artifact in your own lens-swap build and want to understand what is actually happening.
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