dr croubie said:
I got the 70-300L over the current 100-400L basically because of the new design, much better IS, and slightly better IQ in parts (although I would have been a lot better off with the extra 3-400mm in trade for more weight). I've used the pushpull and didn't mind it so badly, half the time I pushpull my 70-300L when I hold by the front barrel.
But if there's a 100-400L mk2, where is the 70-300L going to sit? For the small group of people who absolutely *must* have both 70-100 and 200-300 in one L lens?
If the 100-400L mk2 is priced less than halfway between 70-300L and 70-200/2.8ISmk2, then the 70-300L may as well be dead...
I don't think it will kill off the 70-300L because:
1. The 70-300L is way smaller and lighter. A major reason people get 70-300L, or 70-300 IS non-L or 70-200 f/4 IS is because they want a small, light little lens that is a great walk-around and fine for travel where maybe do some serious shooting and then some snap shooting and then stop in for lunch at some cafe and then run around more for hours all day long. The small ones can even be tucked away in a cargo pants pocket if need be. The 100-400L is simply too large a lens to be a tiny little compact tele-zoom.
2. On APS-C I don't think it makes much difference and the starting at 100mm may even be just as well, but on FF I find the starting at 100mm instead of 70mm to be a big deal. I use a 70- lens as one of my main workhorse lenses in addition to just a little light travel zoom and I find that 70mm is often just wide enough for many short tele-landscape photos when using a FF body but 100mm just doesn't quite do it. If you use a 100- lens then you almost have to have some sort of 28-75/24-70/105 type zoom with you too and maybe need to do lots of lens swapping (and most of those can get a bit rough at the edges on FF) plus a high quality wider lens and then suddenly you are carrying three, sizable, lenses around at once.
3. If the 70- lens will be a main workhorse lens and not merely a little travel lens than you may want better quality than the 70-300 IS non-L or Tamron 70-300 VC.
4. There is also the $1500 vs $2800 which is not an inconsiderable difference.
That said for a compact, full-on wildlife lens where you want some flexibility and not quite the weight or expense of the 300 2.8 and reach really matters then the 100-400 IS sounds pretty awesome. If you don't want or can't with the super-tele plus 70- lens pairing the 100-400 IS is the ideal safari-type lens too.
So just as, currently, the 70-200 2.8 IS II and the 100-400L have little to do with the 70-300L neither will the new 100-400L IMO (other than for a very few who got scared off the old IS and tech in the current 100-400L).