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The actual traditional slide film technique starts with a long focal length lens (at least 200mm in 35mm terms; longer is better) and slide film. A person would take two shots, one IN focus and 2 stops over-exposed, and one thrown completely OUT of focus, and 1 stop overexposed. Once developed, the slides are removed from their mounts, placed on top of one another, and remounted into a slide holder. The over-exposures then add together to make a (roughly) properly exposed shot which has a light, in-focus image at the core, and an overall "glow" from the out-of-focus image.
These instructions are merely a starting point. This technique takes a bit of trial and error with (expensive) slide film; after losing patience with said expensive slide film, I attempted to recreate the general idea using a scanned, properly-exposed slide image which was then modified by multiple layers of gaussian blur (mimicing out-of-focus lens blur), with variable opacities for each layer (to mimic overexposure). It's not quite like the examples in the book, but I like it nonetheless since it's in the ballpark. I'd like to try it with a few more shots but I'm particular about which images I think are correct for the technique.
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