Pls help me out here.
I recently just bought a 2nd hand Canon EF28-135 IS USM lens frm
a fellow member here. There's one thing I would like to ask, why when
my camera is facing down to the floor(i.e to say camera body parallel
to the floor), the lens will automatically slide down and extend its zoom
from 28mm it will extend out all way to 135mm. And when i point the
camera facing upwards, the same thing happens. Lens will automatically
slide down from 135mm back to 28mm. Is there any thing wrong with the
lens or is it just that the lens is heavy that's why this occurs.
Please enlighten me..thanks guys, i appreciate ur help.