by lobaz » Tue Oct 06, 2020 1:14 pm
First of all, if you make the image smaller 10x in XY (lateral) directions, it gets 100x smaller in the Z (depth) direction. Instead of a smaller sphere you get mostly flat lens shape.
I am not sure what may be the main reason for apparent depth of field reduction. First, if the large original is recrded with laser of limited coherence length (background is not recorded), that limit gets much closer in the smaller H2. Second, aberrations of lenses used to make the image smaller might affect distant parts more than closer parts, but I am just guessing.
First of all, if you make the image smaller 10x in XY (lateral) directions, it gets 100x smaller in the Z (depth) direction. Instead of a smaller sphere you get mostly flat lens shape.
I am not sure what may be the main reason for apparent depth of field reduction. First, if the large original is recrded with laser of limited coherence length (background is not recorded), that limit gets much closer in the smaller H2. Second, aberrations of lenses used to make the image smaller might affect distant parts more than closer parts, but I am just guessing.