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Found 2 results

  1. Hello together, For time lapsing stars at night, i wanted to try, which ISO setting is usable, before visible noise appears. I'm using the a6500 with the 18-105. Firmware of both is up to date (Body: 1.04, lens: 04) For this test i just left the cap on the lens and tried different ISOs with different shutter speeds: Starting with ISO100 and 120s Shutter speed (external controled), going on doubling shutter speed and ISO up to ISO51200 with 1/4s. I saved and evaluated both, JPG and ARW (converted in TIF with Sony Image Data Converter Ver. 5) At first it looked good until ISO800 didn't produce any perceptible noise. But then, i discovered something strange: At ISO6400 with an shutter speed of 2s (internal controled), there appeard some bright pixels, but with ISO12800 with 1s shutter speed and also higher ISOs there isn't. By the way, StadyShot, NoiseReduction at long exposure and Silent Shooting is off. E-Front Curtain Shutter is on. I thought it belongs to an special ISO Value, so at the next test i tried everx ISO setting between 3200 up to 12800, always with an Shutter speed of 2s (internal controled). At this test i had single bright pixels in every single picture, getting brighter with higher ISO settings. Then I thought, let's again look at lower ISO settings, but now with 10s fixed shutter speed. Changing ISO from 100 up to 3200. Now, there weren't bright pixels at all, even with ISO3200, where i had bright Pixels at an shutter speed of 2s. At this point, i understood, that the appearing of bright pixels seems to change with shutter speed, but not with ISO settings. Next, i testet all shutter speed between 1s up to 10s with ISO3200. And in this test, the bright pixels only appers at shutter speeds of 1s up to 3.2s, getting brighter at longer exposure. At an shutter speed of 4s and longer, they disappeared. Because the bright pixels getting brighter at longer exposures, according to my imagination, it cannot be an EMC issue with the shutter, because this would always give us the same brightness. Regardless of this i also tried to just use the electonic-shutter with the setting "Silent Shooting" and reverse just using the mechanical shutter by putting "e-front cutain Shutter in Off-position, but both didn't change anything on the appearing of the bright pixels. Following two pictures, the first one with ISO3200 and 3,2s, the second is ISO3200 at 4,0s. Because i can upload just smal files, the picture is cropped, you can see just the upper left corner (1/4) of the real picture. By uploading the pictures here, they getting compressed even more. I also tried the gallery, but it also compressed them. But i think, You get the point, even the noise is not that sharp anymore. I also brightened the pucture two times with +150 with Adobe Photoshop. Now you also can see noise in the picture shot at 4s exposure time, but it's much less, even it should be a little bit more because of the longer time. What is the reason for this behavior. Can someone confirm it. It's not difficult to reconstruct, just use the same settings. What can I do against it. One more little question: Can someone tell me what to do to make the camera display the picture number? It shoes a number, but this is just a counter of pictures on the SD-card. So, if i delete some pictures, this number doesn't match to the picture number anymore. Greetings Jörg
  2. Hello everyone, So back in August I bought a brand new, in the box Sony Alpha A6000 from a Korean retailer on Ebay. It took a while to come in but once it did, I was really happy and started snapping away. But when I brought the JPEGs onto my computer...I noticed that they looked awful. I saw really high noise at 0% crop in even bright conditions with low ISO settings (~250). I looked at the metadata and found nothing awry. I found this youtube video: https://youtu.be/6FVuO8FezjA and made the following changes: High ISO NR -> off Long exposure NR -> off And then I switched off one more setting that I can't remember... But nothing did the trick. I'm still seeing high noise levels in my low ISO shots, something that my Nikon D5100 never had. I contacted Sony support but they were stumped. I tried to return my camera but the ebay merchant drug their heels until the return window passed and then denied my return. Please help.
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