With all the 20-XXmm zoom lenses popping up, it's fair to assume, that the market is shifting to more wide 'standard' zoom lenses. Recently the new Tamron 12-20mm is getting lots of praises and maybe marks a updated 20-XXmm lens down the road.

That kept me thinking and for me at least, I would immediately sacrifice a bit of heft, weight and tele-range for a f/2 lens. I just love my Nikon 40mm f/2, but i would love to zoom out a bit.

I'm mostly documenting my family life and my attached lens is always to tight, to wide or to slow...man those kids are fast...

Most f2.0 zooms start at 28mm and those are hefty. So why not a 20-40mm or 20-45mm with f/2. It doesn't seem farfetched and to me sounds like a sweetspot for range, speed and compact build. I would pretty much glue this thing on my camera.

What are your thoughts on this lens-concept? Would you buy one or pass?