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vertical lines in digital photos

Jason Dunsmore , Nov 20, 2005; 02:17 a.m.

What is the cause of the vertical lines in this photo?

I was trying to get a sharp image, so I used a small aperature and a long exposure.

Thanks.

Responses

Mark U , Nov 20, 2005; 04:03 a.m.

What camera are you using? Are you getting this effect on all your photos, or just this one?

John Schroeder , Nov 20, 2005; 11:28 a.m.

The lines are not verticle but follow the contour of the glass. My idea is that you captured the imperfections the glass. The large depth of field created by the small aperture would allow for this.

Berg Na , Nov 20, 2005; 11:40 a.m.

The 'lines' appear to be caused by slight differences in brightness between adjacent columns in the sensor. This is typically seen in CMOS imagers although I don't know what camera you used. The variations do not change over time so the cameras that use CMOS sensors normally have a function that automatically subtract them out. If you continue to observe this artifact in your images, I'd send the camera back for calibration.

Peter White , Nov 20, 2005; 01:35 p.m.

They aren't vertical lines. What you're seeing is reflections of some sort. It's not anything related to the sensor.

Try the same shot with a film camera. I suspect you'll get the same thing.

Jason Dunsmore , Nov 20, 2005; 02:44 p.m.

The photo was taken with a Canon 20D. You were right John and Peter, they are just reflections. Although I have seen vertical lines that look similar to the ones in this photo before. It was with a cheaper Sony MVC-CD500 camera. Thanks for the information Berg, that answered my question.

John Schroeder , Nov 20, 2005; 05:44 p.m.

What is even more amazing is that I recognize this as a Galileo thermometer.

Berg Na , Nov 20, 2005; 05:59 p.m.

Jason - I suspect the regular banding seen in this photo is not due to some kind of optical reflections, but I won't try to dispute your conclusion.


Vertical banding artifacts

Jason Dunsmore , Nov 21, 2005; 12:51 a.m.

Yep, it's a galileo thermometer.

The reason I think they're reflections is because the lines aren't exactly vertical, and I can see similar reflections when I look at the thermometer. It's deceptive though.

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