Originally posted by todd Reveals his loyalties to the emperor, he does. - Yoda.
I been found out...
Quote: The new Pentax 24-70 f2.8 could work for you, except no WR.
HD PENTAX-D FA 24-70mmF2.8ED SDM
WR HD PENTAX-D FA 24-70mmF2.8ED SDM WR / Standard-Angle Lenses / K-mount Lenses / Lenses / Products | RICOH IMAGING Quote: I also sold the 31 as it was over engineered for an APS-C normal angle lens.
What could be wrong with an over engineered lens?
This displays an lack of understanding of what folks pay for in a lens. What the 31 has better than it's competitors is really smooth out of focus areas. I've seen many images in many comparisons where the subject sharpness was the same, but the bokeh was busier. So, if you're not in to ad agency type shots with their smooth backgrounds, ya the 31 is a waste of your money and over engineered. But it's easier to get smooth bokeh on a 36x24 sensor camera, due to an extra stop less DoF for a given ƒ-stop. So, in that sense the 31 is more crucial on APS-c than it is for FF.
The only people who say things like the above are those who never understood what they were paying for, or who always used the lens stopped down to ƒ5.6 through ƒ16. If you never used the lens at ti's sharpest at ƒ4, or less, you probably never noticed the difference. I've seen folks run comparison tests for their favourite 28mm lens or what ever and not notice the difference, and claim the images were practically identical. You have to know what you're looking for.