One of Olympus´ claims for the new OM-D E-M1 is better image stabilization at slower shutter speeds. Just to get an idea what´s happening I made a simple test. During this day I shot a test series four times with E-M1 and E-M5 cameras. The result is shown in the picture below.
Some of you may remember my previous similar test when E-M5 came. This time I used M.Zuiko 75mm lens to shoot Playstation ready-LED from a few meter´s distance in a darkened room. I had 1 second as my shutter speed all the time. E-M5 had IBIS at setting 1 and E-M1 at IS-auto. I took 13 shots with both cameras, went back to write my Lightroom book, came back and did another series and so on four times. I alternated which camera to shoot first with each time. All this was to keep the situation as neutral and repeatable as possible.
From each 13 shot series I chose 10 least shaken images. I opened 100% crops of those ten images in Photoshop as layers and combined them with blending mode set as Lighten. This picture shows one crop marked as Best. It is quite sharp and it actually is quite astounding that there were some shots like at 1 second shutter speed with 75mm lens. If I had 10 equally sharp shots and combined them carefully above each other with blending mode Lighten, the image would not change at all. In reality every series had good and bad shots, that´s why there are two rows of "blobs", the more shaken shots are the larger each blob comes.
I organized my eight results in order from the best to worst. E-M1 was the best twice and E-M5 the worst three times. For me this shows that there is an improvement in E-M1´s IBIS capability with "longer" shutter speeds. Which gives me a reason to test later on what are my longest "sure" exposure times with E-M1 and my most used focal lengths.