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<blockquote data-quote="GPSF" data-source="post: 304817" data-attributes="member: 24963">Thanks for all the help everyone, really appreciate it!&nbsp; Still not seeing a pattern to what causes the black line to appear based on the settings (other than it's sometimes easier to see it at high ISOs).&nbsp; I'm having a little trouble figuring out how to add more photos to this thread, but basically I took some more photos at ISO 25600, f/5.6, 1/8000sec and the line was probably about a diffuse as the &quot;3 of 4&quot; photo shown above and the amount it was diffused seemed to be somewhat influenced by focus.&nbsp; Will keep fiddling with some settings and see if I can figure out anything else.When I looked at the sensor, I looked at with both the mirror down and locked up and didn't see anything on the sensor, anything hanging down from the mirror, or stuck to the sides.&nbsp; Given how static the line is, seems like it's either pretty stuck to the sensor or it's an issue with the sensor itself.I bought the camera in June 2011, so I'll go back and look through some of my earlier photos and see if there's any appearance of the line.&nbsp; I went back as far as early 2013 and if it was there, it certainly isn't as prevalent as it has been over the past 6-10 months.&nbsp; I don't think it was caused by the cleaning itself because I'm seeing the line in pre-cleaning photos and that was the first time I've had the sensor cleaned - maybe the cleaning exacerbated the issue?</blockquote>

[QUOTE="GPSF, post: 304817, member: 24963"] Thanks for all the help everyone, really appreciate it! Still not seeing a pattern to what causes the black line to appear based on the settings (other than it's sometimes easier to see it at high ISOs). I'm having a little trouble figuring out how to add more photos to this thread, but basically I took some more photos at ISO 25600, f/5.6, 1/8000sec and the line was probably about a diffuse as the "3 of 4" photo shown above and the amount it was diffused seemed to be somewhat influenced by focus. Will keep fiddling with some settings and see if I can figure out anything else. When I looked at the sensor, I looked at with both the mirror down and locked up and didn't see anything on the sensor, anything hanging down from the mirror, or stuck to the sides. Given how static the line is, seems like it's either pretty stuck to the sensor or it's an issue with the sensor itself. I bought the camera in June 2011, so I'll go back and look through some of my earlier photos and see if there's any appearance of the line. I went back as far as early 2013 and if it was there, it certainly isn't as prevalent as it has been over the past 6-10 months. I don't think it was caused by the cleaning itself because I'm seeing the line in pre-cleaning photos and that was the first time I've had the sensor cleaned - maybe the cleaning exacerbated the issue? [/QUOTE]

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