E-M1 vs. E-M5 Noise/Hot Pixels at long exposure

I don't have e-m1 but the sensors should be similar. From nex-5n to nex-6, the sensor got a small hit per dxo tests due to addition of af points like they did w/ e-m1. But in real world shots, it is hard to see that much difference.

Other things causing additional noise/hot pixels might be the sensor heat, eg if you were using e-m1 before the test. You need to cool down both cameras before you can test it. Also you can remap the sensor pixels and see if that helps.

 

Lightroom 5.2 is seriously weak for the E-M1. I found you can't create your own profiles, it looks like the current profile is baked in and the red channel is seriously over done. I'd wait until the next release to judge the RAWs at this point.

 

Any chance that you ran pixel mapping on the E-M5 at some point, but not on the E-M1?

With long exposure NR off, I would definitely expect to see a fair amount of noise from both.

 

When I look to your test picture, I support "dhazeghi"s guess: pixel mapping.

I had the same effect for my E-M5 when I got it back from LCD repair. I was shocked about the hot pixels but after thinking about it the reason was simple:

Olympus had set the cam to factory defaults and the pixel mapping was resetted too.

I did the pixel mapping in the utility menu once again and my camera is back to normal behavior since then.

 

Wow. Oi, is the em1 heading to a halt and delay like the pro lens? That's a pretty serious poorly functioning true pic 7 processor.

 

I wouldn't expect NR off on a 60 second exposure to look clean on any camera. Are you sure the E-M5 has NR off? Maybe the camera applies NR automatically even when off, there are cameras that have been like this before.

 

Dark frame subtraction means the exposure takes twice as long, so it should be fairly clear if it's there or no. Standard noise-reduction settings (noise filter in Olympus parlance) only apply to JPEGs/RAW processed in Olympus Viewer

 

Sorry if it's a bad suggestion, but perhaps you can post over on the Dpreview M4/3rds forum? It seems quite a few people have received their E-M1 there.

 

Are they cooking the RAWs in the e-M5?

Do the PD-AF pixels on the E-M1 cause the noise here?

Just my two possibilities.

 

I think the problem is the e-m1 doesn't have dark frame on by default. This really isn't an issue.

 

You don find it an issue that the EM5 greatly out performs the state of the art latest and great PRO EM1.. Really HUH????

As for dark frame on .. isn't that the feature that causes you a full extra shot to be taken and then zeros out the noise.

The EM-5 didn't have it on so why should it be turned on for the EM1

Since both cameras were setup the same.. why should the EM1 be handicapped needed the dark frame subtraction..

OP.. can you redo the test at another ISO like 800 and see if you get similar profiles for the EM1 and EM5.

 

Lightroom will (usually) automagically remove hot pixels from raw files. There's no way I know of to turn this off or on; it just happens. As the EM-5 support is mature and EM-1 support isn't, perhaps that figures in?

But - that does NOT address the hot pixels in the jpg out of the camera. So I'll be watching with interest.

Threads for reference:
http://lumenatic.com/2011/08/17/hotpixel-removal-in-lightroom/
http://photo.net/digital-darkroom-forum/00Lada

 

You seem to misunderstood. We thing the e-m5 simply have dark frame on by default.

You take any camera out there and you don't turn on dark frame subtraction you are going to get some noisy images with long exposure. It's just the nature of the beast with imaging sensors today. The longer you run them the hotter they get and the more noise you get.