26x26cm black glass ambrotype
exposure time 5 seconds
hermagis 350 mm f 4.5 wide open

I had the honour to make a wet plate portrait of Erwin Olaf.
One of the best Dutch photographers.
More info about that shoot you can find on my weblog:
http://collodion-art.blogspot.nl/2013/07/erwin-olaf-extremely-talented.html