I am not on the market for these lenses at the moment. But if I were, I'd be torn. My current "most universal" lens (i.e. the one that is attached by default) on K5-IIs is 17-70, which provides the FOV similar to the full-frame camera with 25-105. And I am using the wide end much more often than the long end of the range. But every so often, I enjoy that extra reach to 70 (105), even though the image quality is a bit lower there. If I have time, I am switching to 50-135 for the longer range, but for a quick grab, 17-70 does a reasonable job @50-70mm.

So, ideally I'd want 24-105. :-)
But with what is available, if the price wasn't in the consideration,
I'd choose 24-70, primarily due to the wide end.
f/2.8 is an added bonus.

With the Pentax film camera, my first and "primary" lens was Tokina ATX Pro 28-70/2.6-2.8, and I bought that for the speed and for the good IQ optimized for the price. I was missing on the wide end, and that's why I bought Tokina 18-35 (or was it 19-35?).

Igor



Gonz Wed, 20 Jul 2016 12:20:17 -0700 wrote:

The reviews on B&H are very positive for both lenses, with lots of
praise for the 28-105's sharpness.



On Wed, Jul 20, 2016 at 2:14 PM, Larry Colen <l...@red4est.com> wrote:


Gonz wrote:

Anybody have both of these lenses and compared them?  The 24-70 is
almost 3x the price of the 28-105 and besides the constant 2.8
aperture, is the image quality that much better?


I'm curious too.  I got the 28-105 as an all weather daily driver lens.
Since I already had a tamron 28-75 (not weather sealed), and we've had dry
weather, I've hardly even had the 28-105 on my camera, as I find I need the
faster lens more often than I need weather sealing or a bit more reach.

I will note that even if you don't already have a third party 28-75/2.8 you
can pick one (particularly a used one) and the 28-105 up for less than the
24-70.


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