AceVentura1986 Posted January 1, 2020 Share #1 Posted January 1, 2020 (edited) Advertisement (gone after registration) Hello, all. I’ve attached crops of two photos I’ve shot at long exposures with my M9M and a 50mm Summicron. The vertical one with the building is a 250 sec exposure and shows a distinct vertical division. In the full image, this division appears to be in the exact center of the image, as if the left and right read outs were somehow different. This aberration has appeared in a handful of my long exposure photos and usually after a few shots. I’ve thought it could be overheating but that’s just a guess. The horizontal image is a 45 sec exposure and shows horizontal banding. This was only the third of three long exposure photos I shot today but each show this horizontal banding. The banding is shown in the water, just below the horizon Both were shot at ISO 400. I tend to shoot at this as my base because I read somewhere that it was less prone to banding when pushed 2 or 3 stops than the base ISO of 320. Also, this sensor was changed in February, 2018 to the new improved sensor the work was performed by the mothership in Wetzlar. Also, I tested the camera at home with an exposure of about 1/250 of a sec and found no banding at all. Finally, I use a Panasonic Gold, 32gig card. It is about 4 years old. Either way, does anyone have any ideas about this? Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Edited January 1, 2020 by AceVentura1986 Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/304925-long-exposure-banding/?do=findComment&comment=3882801'>More sharing options...
Advertisement Posted January 1, 2020 Posted January 1, 2020 Hi AceVentura1986, Take a look here Long Exposure Banding. I'm sure you'll find what you were looking for!
jaapv Posted January 1, 2020 Share #2 Posted January 1, 2020 The centerfold issue is an imbalance between the two amplifiers on the motherboard; the sensor is read out in two halves. It will most likely require a sensor replacement, as the sensor/motherboard comes as one soldered unit. The banding is not unknown, in general the M9 has some difficulty with the stability of the power supply. However, on there is on off-chance that both problems can be traced back to power fluctuations. A possible source for the banding could be the proximity of a mobile phone. Interference causing banding has been described. 1 Link to post Share on other sites More sharing options...
AceVentura1986 Posted January 1, 2020 Author Share #3 Posted January 1, 2020 10 hours ago, jaapv said: The centerfold issue is an imbalance between the two amplifiers on the motherboard; the sensor is read out in two halves. It will most likely require a sensor replacement, as the sensor/motherboard comes as one soldered unit. The banding is not unknown, in general the M9 has some difficulty with the stability of the power supply. However, on there is on off-chance that both problems can be traced back to power fluctuations. A possible source for the banding could be the proximity of a mobile phone. Interference causing banding has been described. Thanks. I’m pretty sure I’m out of warranty now so this will remain, at least for now. Looks like I’ll be using my Canon for Long exposures. Pity, because I really like the way these look. Link to post Share on other sites More sharing options...
jaapv Posted January 1, 2020 Share #4 Posted January 1, 2020 The centerfold can be repaired in Photoshop without too much trouble - Select with rectangular, at 200% to be pixel-exact, layer via copy, switch to multiply and match the density with the opacity slider. You can make an action out of it to make it a one-click operation. The banding: Topaz DeNoise could be helpful. 1 Link to post Share on other sites More sharing options...
AceVentura1986 Posted January 1, 2020 Author Share #5 Posted January 1, 2020 Thanks. I actually don’t have photoshop but rather just have a very old version of Elements. I pretty much live in Lightroom. Link to post Share on other sites More sharing options...
AceVentura1986 Posted January 3, 2020 Author Share #6 Posted January 3, 2020 So, events took an odd turn today. I went shooting in exactly the same spot but brought my Canon 6D instead of the M9M. I’ve attached a small crop of just one of the photos. All the Canon images display a very slight banding in the water, just below the horizon. In this photo it’s most visible just under the bridge in the distance. It is not nearly as pronounced as the M9M photos, but it is visible at 1:1 magnification. The only thing I can think of is that this is an error in Lightroom. Any thoughts? Has anyone experienced his in Lightroom before? Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/304925-long-exposure-banding/?do=findComment&comment=3884039'>More sharing options...
a.noctilux Posted January 3, 2020 Share #7 Posted January 3, 2020 Advertisement (gone after registration) I don't use LR, could you share some RAW files somewhere for us to see if this is a LR problem ? Link to post Share on other sites More sharing options...
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