Robert Coe wrote:

[50-150mm]

: It weighs 95% as much as 70-200 f2.8 Fx zooms.

Yeah, but a bottom of 70 leaves a 15mm gap between it and, say, the Canon
17-55 (which I have).

A non-problem.
People used to have lens choices like 24mm, 28mm, 35mm, 55 or 55mm,
85mm, 100mm, 135mm ... and not a zoom in sight. It worked.

I have -40mm, 50mm and 70-mm. I don't have problems with the
"missing" 10mm and 20mm.

However, the 50-150mm has a 50mm gap between it's end and the
70-200mm's end This is about the difference between a 150mm
without and with a 1.4x teleconverter.


: There are good APS-c wide zooms which top out in the 70-85mm focal
: length range if you really don't want to "lose" the 50-70mm range.
: The 50-70mm range is usually able to be compensated for by "zooming with
: your feet" if you need to frame everything perfectly ex-camera.

Depending on where you are and what you're doing. It can be hard (or at least
embarrassing) to "zoom with your feet" at an awards ceremony, with all the
wives and mothers cursing you for getting in their way. ;^)

It can be even more hard and embarassing to zoom the missing 50mm
in with your feet shooting the big cats at the zoo. :-)

Anyway, if you have to switch between your -55 and your 50-
lens --- which is gonna happen, if you don't plan ahead and
be at the right spot at an awards ceremony --- you're going
to lose the shot anyway. If you can plan, you can plan for
the gap.

-Wolfgang