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Author Topic: Panasonic Lumix DMC-GX7 Retest  (Read 773 times)
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« on: January 28, 2014, 02:04:39 PM »

This a comment for this page on the website
Where are the results of the promised GX7 retest?  It has now been considerably more than the "1-2 weeks" indicated by Emilie January 7th, in response to someone else's comments, above.  (Notably, in another of Emilie's replies, it was acknowledged that the second GX7 had been received, ready for retest, that same day.  Even if retesting is still incomplete, we are overdue at least a hint as to whether the new results are looking different than first reported.
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Sophie
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« Reply #1 on: February 06, 2014, 04:01:02 PM »

We did many other tests on a new camera and measurements achieve a very similar sharpness score. We have some other tests to perform before publishing any other update, but results look less sharp than expected.
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Anders W
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« Reply #2 on: February 07, 2014, 02:38:08 AM »

I presume that you do lens tests at the ISO where the camera does best according to your sensor test results. For the GX7, that would be at ISO 125. However, as explained here,

http://forum.dxomark.com/index.php/topic,2414.msg4338/topicseen.html#msg4338

your results for that ISO are in error. At this ISO, the sensor reaches its FWC (full well capacity) at an ADU-level of approximately 3000. The signal therefore never reaches the limit set by the ADC (about 4000). The fact that the signal cannot reach higher than about 3000 at ISO 125 may in turn have an impact on the contrast measurements conducted for your lens tests. I would appreciate if you could investigate this possibility and let me know what you find.

Anders
« Last Edit: February 07, 2014, 02:40:31 AM by Anders W » Logged
Sophie
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« Reply #3 on: February 12, 2014, 04:34:48 PM »

Hi,
Thanks a lot for this suggestion, but we always shoot MTF chart at ISO 200 in order to avoid that kind of trouble.
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