In my part of the world most photographers may deal with Heat shimmer from the ground on warm days and it is nearly impossible to get a sharp shot on long distance with a supertele, but....
1.: Why does it seems to be nearly as bad on short distances near the focus limit? (Can the heat Affect the gear and micro-adjustments, so it is not the heat shimmer from ground I have to blame for ALL the blur on the photos...? ...or are there shimmer inside the lens, when it is warmed up?)
2.: Why does it seems to have a lighter effect on lighter lenses?
It is a general issue and I know about the effect from Heat shimmer, but can´t figure out the 2 questions! Last week we were 8 photographers with different gear but same experiences, so it is not my skills or adjustments I ask for advice about. (I believe that in any case, but of course, I am open to suggestions...)
Anyone who have a Technical explanation or which may refer to articles about the subject?