with 8 boxes of Kodak Tmax 100 readyloads on the shelf getting further from their expiration date, I decided to pull out the BTZS calculator , 4X5 camera and find a test target/scene and have a go of it. The gray/black bench is in full shade, the sky is just past noon . The film was processed in BTZS tube in TmaxRS 1+7 @ 70F . SBR for this scene was 7.2. Exp date is May 2007 but I see no loss of speed or tonal quality. I am happy ... but time to use up my precious Readyloads ..... sigh !