First time I am seeing this thread. The second picture with concentric rings ever largening, turning brown, and the yellow halo, thats pretty textbook for early blight, much better disgnosis than late blight. The first picture looks fungal too, maybe grey mold.
I would cut off any diseased leaves, bag them, then spray with liquid copper fungicide mixed to the weakest recommended strength for tomatoes,above and below the leafs and the stems down to the soil line. Repeat your spray in 7-10 days, and after a heavy rain.
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