Typically, lenses like the Tamron 17-50 F/2.8 or the Nikon 17-55 F/2.8 are suggested whenever someone asks for a good lens to use in low light indoor conditions (avoiding flash). I intend to get one such lens as soon as I can afford it (most likely the Tamron). But I was wondering how effective this would be in helping you avoid flash. My kit lens (Nikon 18-55, the non-VR one) supports 3.5 at the wider zoom end. And with 3.5 (using Aperture priority mode) the only way I can avoid flash is to use ISO 1600 which gives pretty crappy pictures using both the D40X and the D80 (the two cameras I own). Would getting a lens that gives me an F/2.8 aperture really make that big a difference? Assuming I shoot at 800 ISO, will the 2.8 aperture setting allow me to shoot good pics without flash in indoor lighting using the kit lens? My only other lens is the 50mm F/1.8 but that's not remotely wide enough for getting everyone in frame. Also at 1.8, it results in backgrounds that are often too washed out and it's also very hard to get everyone in focus. Before I get the Tamron lens (400+ bucks), I was wondering if it will actually solve my problem. Or whether it'd be better to invest in an SB-600 and use bounce flash to get natural looking pictures (though I doubt they'd be as good as no-flash pictures).