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If it's just to get slides into digital files, and you aren't precious about the "best quality ever", then those tubes which fit onto a camera with a slot for the slide at the other end, are quickest and easiest. Next step up is a flatbed scanner with a slide holder - this will seriously increase your work time and make you wish you never started.
Professional photographers may have a different opinion, but they don't mind spending 10 minutes scanning one 35mm slide.
Any recommendations for slide digitisers?