Same Schneider XL lens design series, different focal length. The 58mm will NOT cover 5x7, the 72mm does. The 72mm results in a different angle of view on 4x5 than the 58mm..
Yes, the IC of the 72mm is larger than the 58mm. Ease of use is a non-issue for a camera easily capable of pushing the 58mm or 72mm beyond it's IC limits. If ease of use is related to angle of view, that is a different aspect of these two focal lengths entirely.
Bernice
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