Hi all, I am trying to get a fix on what i gain by adding a 28mm f1.4 lens to my kit. Using a hypothetical, If I use a 17-55/2.8 lens to take a photo under somewhat dark ambient light and the 17-55 is set at the lowest f stop, f2.8, making the correct speed for exposure, 1/60 sec. How much faster might the same exact shot under the same ambient lighting be if I had a 28mm opened to f1.4? I would love to hear from someone who could actually conduct this experiment especially with examples. Also, as a side issue, I have heard that the wider the lens, the more light emited at the the same aperture, such that... a 85mm f1.4 would be correctly exposed at 1/60 sec, while in the same ambient light, a 28mm set at f1.4 and (guessing here) say 1/125 sec would yeild the same exposure. Is there any truth to this, I am not sure of the validity of the poster who made this statement. It was not at this forum. Thank you for your responses.