11-21-2017, 10:43 AM
BC, you also can imagine - like me - the radius or at least the shape of the "in-focus-field" can change depending of the distance?
I imagine a relief which changes between close and far distance it's levels.
Therefore there might be field curvature at testing distance, but a very different one at infinity. Speaking of infinity: Stars are not arranged in a focal pane... question just remains if in the curvature focus at infinity is possible or not.
I imagine a relief which changes between close and far distance it's levels.
Therefore there might be field curvature at testing distance, but a very different one at infinity. Speaking of infinity: Stars are not arranged in a focal pane... question just remains if in the curvature focus at infinity is possible or not.