Culprit

Culprit

All I can say is "filthy". I had been having to clone out spots from time to time under certain conditions of shooting. Today I was hitting those conditions quite often- low apertures, bright light and white backgrounds and it just got to be too much work to clone them out. So I looked for how to spot sensor dust and found this:

Take a longer lens (maybe 100mm), smallest aperture possible (f22 if possible), and open Notepad on your computer (has a white background). Handhold the shot (several seconds likely at f22 and ISO100 (important if you can lock it to that) and make sure focus is set to nearest focus. Make sure the screen is *not* in focus- hold the camera maybe an inch away. The motion from handholding will ensure you are only getting white light in.

After you take the shot, import it into Photoshop and automatically process the levels.

This was the result for me. "Wow" is all I can say. Besides "filthy" that is. I’m gonna have to get this thing cleaned. I’ve been shooting a lot of 3D stock, and this is doubly problematic in that mode, because unless you are very careful with cloning, the clone spots themselves can reveal themselves when viewed in 3D.

I do not see this level of dirt in my images most of the time, but in those certain condition I was seeing dozens of the worst offenders. But that is "dozens" and this is hundreds and hundreds. I had not clue it was *this* bad. Wow.

Posted by 3dphoto.net on 2012-04-21 23:59:47

Tagged: , Sensor , CCD , Dust , Dirt , Spots