Actually, I have the 10-20, but I rarely use it... if I do, I have a hard time using it!
Besides, for what I shoot, I figure 16mm is wide enough for me (indoor shots, group shots...) which is why I'm selling it to fund the 16-50/2.8 or 16-45 + 35mm limited... I actually considered the 21, 40, 70 combo before (especially to use with my K100d) but was turned off by the price and relatively slow 21 (though IQ-wise, beautiful!), then the 35mm limited was released and I fell in love!
So I'm thinking now:
- 16-45 or 16-50* for wide to normal use...
- 35mm limited (if I choose the 16-45) for a nice, compact walkaround that's fast enough and versatile enough for long to close up shots...
- 50-135* for my mid to tele needs (I have the 18-250, but I find it too slow and looking at my EXIF, found I use the 40-120 range 90% of the time)
- and a Sigma 105 macro for insect macros...
I already have the latter 2 so the wide end is what I am lacking...