Looking for a "normal" FL zoom lens to use on my N80 35mm SLR for family and toddler shots, I have narrowed my choices down to just the Tamron 28-75/2.8 or the Nikon 28-105/3.5-4.5. Now to round things out -- corner sharpness is very important to me since I blow-up my film shots rather large and I also have a scanner capable of doing that. I can live with the limited zoom range of Tamron if it has the better corner/edge sharpness of the two. Likewise, I can live with the moderate max. aperutre of the Nikon 28-105 if that happens to be the one with the better corner sharpness. So, between the Tamron 28-75 and the Nikon 28-105 -- which has better corner sharpness on 35mm film/FX? .