I was just wondering if your using for example a f3.5-f4.5 none constant aperture zoom at what point does it change aperture during the zoom travel ? because this could be very significant if it is used with a hand held light meter or none TTL strobe, what I'm asking is, is the transition gradual throughout the zoom range ?.
It is gradual on the lenses I have.
On lenses of this type I tend to avoid using the wider/variable apertures. With the example you gave I'd treat it as a 4.5 and use A or M to keep it out of the variable range.
Mark Barendt, Beaverton, OR
"We do not see things the way they are. We see things the way we are." Ana´s Nin