- Credit: Mark Castleman
- Caption: I took this on a cruise of the Duluth Harbor. All the tugboats are owned by Zenith Tugboats of Duluth and liked how they were all in the same paint and all in a line.
- Camera Make: PENTAX Corporation
- Camera Model: PENTAX K10D
- Aperture: f/5.6
- Shutter Speed: 1/90
- ISO Speed Rating: ISO100
- Exposure Bias: 0ev
- Focal Length: 50mm
- Copyright Notice: © 2007 Mark Castleman
- File Name: mark_castleman.jpg
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