I was never a fan of Ektachrome. The best slide film, overall, is Fujichrome Provia 100F, IMO. Great colors, natural skin tones and no reciprocity failure for 2 minutes. I have two 25-sheet boxes of Velvia 50, but Provia is much easier to shoot with.
Unfortunately Velvia 50 in 4x5 is no longer available. I bought 3 boxes before it was discontinued so I will be sadly enjoying it for as long as my stash holds out.




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