I have read that titanium is lighter than other metal alloys used by camera manufacturers. I was looking at a Nikon F3/T online and was wondering if it is that much lighter than the regular F3? Also, does anyone know if Nikon makes a titanium MD-4 to go with the F3/T? There are several cameras on the market (or at least there were not too long ago) that are titanium models. Are they really any lighter or tougher or is it just marketing hype?