New paanasonic 12-35mm f2.8 and 35-100mm f2.8 lenses

Started Jun 9, 2012 | Discussions thread
Forum ProPosts: 26,278
Re: not so good - here are some chart links
In reply to John Mason, Jun 11, 2012

John Mason wrote:

looking at the reviews at slrgear of this lens, it's so so compared to either the 14-54 II or the 14-35 from 4/3rds days.

Here is the link to slrgear's blur charts:

Olympus 14-35

Olympus 14-54 v 2 that focuses well with cdaf

and the new Panasonic offering:

The Olympus lenses are significantly sharper especially wide open. They are not even in the same league.

I want an SHG level lens from Olympus for m4/3rds!

At least the 14-54 II works well with cdaf and the adaptor.
John Mason - Lafayette, IN

In fact, you can't really compare those tests very easily. The 14-35 was tested on an E-410 (10MP) while the 12-23 was on a GX1 (16MP). The BxU bur unit is nominally equivalent to a PS blur operation, so is obviously dependent on the pixel size. SLRGear says:

Different cameras and different settings will produce different BxU numbers! This means that the BxU numbers we report are NOT absolutes, but must be taken as relative values, a product not only of the lens in question, but of the specific camera and settings used to capture the test images as well.

Because of the relative nature of the DxO blur measurements, you can't directly equate results obtained on different camera platforms. By careful choice of the camera settings and the assignment of a relative scaling factor, we've brought the blur numbers for the different camera platforms we use into reasonably close agreement. We have no adequate way to precisely calibrate the BxU numbers between platforms though.

That is, it's meaningless to say (for instance) that a particular Canon lens tested on the EOS-20D and showing a best-case BxU value of 1.5 is "better" than a Nikon lens tested on the D2x body and showing a best-case BxU value of 1.8. For this reason, we show only graphical results rather than numeric ones, and actively discourage people from making quantitative comparisons between lenses based on our data.

The differences between these lenses are generally less than a blur unit, so the conclusions that you are trying to derive are not reliable.

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