GX1 Shutter-Induced Decrease in Lens Performance

Additional lenses were tested to see if there was GX1 shutter-speed associated decrease in lens MTF50 as was found for the X PZ 14-42mm lens. Two lenses were tested: Olympus 45mm f/1.8 and Panasonic 14-45mm f/3.5-5.6 lenses with three cameras. MTF50 tests were run on a tripod with image stabilization off at ISO 1600 and f/5.6 (with the exception that ISO 800 settings were used at 1/5 second shutter speed).

The GX1 induces shutter-speed associated decline in MTF50 performance of the Olympus 45mm f/1.8 lens. The OM-D E-M5 and E-P3 do not.

All three cameras appear to induce mild to moderate shutter-speed associated decrease in MTF50. The shutter speed effect is most severe with the GX1 (MTF50 below 1100 LW/PH) and mildest with the OM-D E-M5. Is this effect GX1 effect visible in images?
Test with GX1 and 14-45mm lens @ 45mm: This is a cropped central image from a USAF1951 resolution test chart. Click on the image to see the series of images taken at ISO 1600 from 1/5 to 1/800 with a GX1 on tripod. Image stabilization is off. Changes detected in the MTF50 chart are not sufficient to be readily visible in the resolution chart images.

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