tag:blogger.com,1999:blog-19092890.post1086606344078618016..comments2024-03-28T17:41:43.970+02:00Comments on Image Sensors World: Sony Fast Readout May Create Banding Artifacts in LED LightVladimir Koifmanhttp://www.blogger.com/profile/01800020176563544699noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-19092890.post-43715686890066974562017-07-05T21:10:04.626+03:002017-07-05T21:10:04.626+03:00This is what DPReview is saying, essentially. The ...This is what DPReview is saying, essentially. The only difference is that they say that 12-row readout makes the band edges more abrupt and, hence, more objectionable.Vladimir Koifmanhttps://www.blogger.com/profile/01800020176563544699noreply@blogger.comtag:blogger.com,1999:blog-19092890.post-9001275198905424462017-07-05T19:22:00.171+03:002017-07-05T19:22:00.171+03:00Ahh... I hate this, when people start making assum...Ahh... I hate this, when people start making assumptions when they do not know the tech. This is absolutely not a result of the new fast readout / conversion speed / scan rate, but merely an issue with the flashing light of LED and short exposure time.<br /><br />The same happens when I point my old A7S (mark I) in video mode* towards a dimmed laptop screen (vaio z1). Shortening the exposure time I get various sized bands and at extreme cases (under 1/200) I start seeing black sections in the image. Shooting a television set produces more random artifacts, as the TV has a "rolling backlight" opposed to the laptops global backlight.<br /><br />*video mode does true readout, while photo mode uses different scan rate for preview. You would need to take a still to judge the artifacts, with video mode its WYSIWYG<br /><br />With 1/200 or shorter time, I am not able to shot the dimmed laptop screen no matter if I use electronic shutter, electronic first curtain or just mechanical shutter.<br /><br />When the exposure time is non-integer multiple of the flashing period, some bands will appear.<br /><br />When the exposure time is shorter than the period, black/unlit sections will appear - shorter the time, more severe the black bands are.<br /><br />Judging the pictures, the guy runs on crazy short expo time with high ISO to avoid motion blur (I do take the same approach for shooting dancers)Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-19092890.post-82518255309285285312017-07-03T22:53:35.438+03:002017-07-03T22:53:35.438+03:00Nope, it fully technical stuff. Like in Pentax K1 ...Nope, it fully technical stuff. Like in Pentax K1 in pixel shift mode (electronic shutter) you will get banding with pulsing light source.Anonymoushttps://www.blogger.com/profile/09514669480909653778noreply@blogger.comtag:blogger.com,1999:blog-19092890.post-87578466917764323022017-07-03T08:16:06.462+03:002017-07-03T08:16:06.462+03:00Seems to be more a problem of post-processing rath...Seems to be more a problem of post-processing rather than the image sensor itself...Anonymousnoreply@blogger.com