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I was playing around with my bellows, trying to get 1:1 scale. This seems to be as close as I can get. It is off by like 0.5mm or less I think. I was really trying to go for handheld 1:1, but it seems I'd need a much better lens for that. Something that is sharper at higher F-stops.
>Tamron 70-210mm lens in 1:4 mode with 109mm of bellows and a ring light; f/8, handheld.
>resized, not cropped