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Tamron AF 28-75mm f2.8 becomes:
39 – 105 f/4 with a 1.4x
56 – 150 f/5.6 with a 2x

Canon EF 50mm f/1.4
70mm f/2 with a 1.4 x
100 f/2.8 with a 2x

Canon EF 70-200mm f/2.8L
98 – 280 f/4 with 1.4x
140 – 400 f/5.6 with 2x

You have reasonably fast lenses so the converters wont hurt too much.