In fact, there are a number of 5x7 field cameras that weigh no more than some 4x5's
True, but the fact that, for example a Canham metal field 5x7 weights less than a Sinar P2 4x5 is hardly remarkable.
What should be compared is the weight of a Canham metal field 5x7 v. a Canham metal field 4x5.
Otherwise, you could also find a 8x10 that weight less than some 5x7 (or even 4x5s).
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