John,
Correct me if I am wrong; but I feel that the increased standoff distance
at the same magification would increase the effect of camera shake. The
reason being that the same amount of "angular" movement of the camera
translates to a greater linear distance when the subject is further away.
To see what I mean draw a triangle with the same angle.... the height
increases the longer the base is.
So using a 90mm f2 at 0.5x and a 50mm f2 at 0.5x gives you different
standoffs... but my reasoning would say that the 50mm f2 has less camera
shake effect than the 90.
Your views?
and moving farther away, or by using a shorter focal length and getting
closer. At the same magnification, going longer or shorter changes
"standoff" (distance from subject), perspective and what the different
perspective does to image depth (unless you're doing copy stand work with
zero subject depth).
.....
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