I have been to the lens archive. I see many people that were posting no longer have this lens in their signature. Is this one of those that people think might be nice to have but after trying it find out it isn't what they had hoped for? It would fit in great with my extensive line up of 2 lenses. I also really like to shot close-up stuff. I would love a lens with this capability yet could be used for regular work as well. I hate not having infinity focus with extension tubes and close up filters. Is this thing sharp enough at the wider apertures? I don't see tons of people owning this one.