E-PM2 is better than GH4 in true low light?

Beach Bum wrote:

I understand better now, but not fully because I've never done stacking. I'm assuming you took one dark frame for each camera after the 12 light frames. Does that work equally to taking alternating light and dark frames (i.e. 24 frames for each camera)?

Also, I highly doubt that heat would affect the GH4 more than the E-PM2. The GH4 is a tank with extensive heat sinking (as you mentioned for video performance). I just can't see how the E-PM2 could move heat away from the sensor better than the GH4, given that the IBIS doesn't allow for good heat sinking.

If your findings are correct and you made no procedural mistakes, then it's far more likely that it's the Sony sensor in the E-PM2 that handles this type of procedure better than the Panasonic sensor in the GH4.

Because the GH3 uses a Sony sensor, I'm wondering how it would perform on this test.

Actually I took about 16 Dark frames for each camera(More Darks than lights). Those Dark frames are averaged together to make one master dark frame for each camera. This works as well or better than taking in camera Dark Frames.

I am not sure why the E-PM2 performs better than the GH4 in this test but it does. If you want to get into AP then my opinion is that you can't beat the E-PM2 even with the GH4. I have the GH3 as well. I could test that one. However, I haven't seen a big difference between the GH3 and GH4 light frames so I doubt the GH3 would fair any better.

Also I tested the GH2 and the GF1 for this object before as well. The GH2 was terrible. The GF1 was actually ok up to ISO 1600. I like the fact that the E-PM2 is ok up to ISO 3200 though.