Quote Originally Posted by Quinn
I've done several "pinplate" images (wet plate pinhole). I've done both Ambrotypes and Ferrotypes/Tintypes.

In the winter/cooler months, I have about 15 minutes before my plate dries and I have employed some techniques that keep the plate from drying out.

Example: http://www.collodion.com/trucks_trees.htm
Nice pinhole photo!!

My 4x5 homemade pinhole camera has an aperture ratio of f/280 and it takes on average about 15-20 seconds to expose Ilford MGIVRC paper (iso=6) on a sunny 16 day. How does that compare to the speed of wetplates?