hi can anyone comment on the performance of this DX lens at 16mm (to avoid vignetting) on an FX camera. most forums i read (including the ubiquitous Ken Rockwell's) just mention that vignetting can be avoided by removing the hood and filter. i do mostly travel photography and detest carrying heavy lenses around, so the nikkor 14-24mm would not really be an option. are there any lightweight f2/8 or f3/5 nikkors (prime, manual etc) that i could consider that will not cross the $1k mark that r better?