I don't own a ND10 filter so I've recently been experimenting with the glass out of my welding mask.
This was nearly a six minute exposure in the early afternoon. The welding glass leaves a green colour cast easily removed in Lightroom or Camera Raw editing.
| camera | Canon EOS 400D DIGITAL |
| exposure mode | |
| shutterspeed | |
| aperture | f/22.0 |
| sensitivity | ISO100 |
| focal length | 33.0mm |
| resolution | 3000x3600 pixels |