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Lens that accentuate chrimatic aberration for colorful effect.

Started May 2, 2018 | Discussions thread
John Sheehy Forum Pro • Posts: 26,688
Re: Lens that accentuate chrimatic aberration for colorful effect.

SmoothOperator wrote:

I was wondering if there are any lens that distortion colors on purpose to add color. I've seen the prism lens and filters, but I am thinking of something more like a fisheye lens than a lens ball. Specifically, not making multiple images or facets, but excentuating a normal image with CA.

I remember once returning a screw-on front-end 1.7x TC because it did exactly what you are asking for, because it wasn't right for the lens I was attaching it to. It was a Canon 1.7x 58mm-thread TC, I believe, on my Sony F707. I bought the Sony TC recommended for the camera, and it didn't do this.

I imagine something could be achieved digitally by tweaking a CA correction the wrong way.

Most software CA correction only corrects mean red band, and mean blue band, so it never really full corrects by original wavelength, which can only be guessed by a more clever correction, anyway, and wrongly assumed to be the same for every photon that charges a photosite, or equally distributed in a white pixel.

I would keep searching for an optical solution, with its analog treatment by wavelength.

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