Just curious technically speaking why do anamorphic lenses have shallower depth of field? Just wondering if anyone who knows how anamorphics are constructed, what it is about them that makes their DoF shallower?
And second question is there any where a resource that can calculate roughly what the equivalent shallowness is? i.e. for instance a 50mm anamorphic prime at f/5.0 is equivalent to a 50mm spherical at f2.8 or something like that?