J Lane 4" x 5" Speed Plates
Limited run. Once they're gone, they're gone!
These plates are coated with experimental Orthochromatic emulsion. High contrast when developed in normal developers. For lower contrast, use low contrast developer.
Meter at ASA 25 as a starting point for moderate contrast scenes. High contrast scenes can probably be shot at 32 or even 50 but you'll have to experiment. Lots of room to explore the potential of this emulsion!
Actual plate dimensions:
4x5: 100 x 126mm
Reference for dry plate sizes: http://camerapedia.wikia.com/wiki/Plate_Sizes
4"x5" plates are cut to 100mm x 126mm to fit ALL plate holders (including Linhof, Chamonix, etc., as well as plate holders from the era of dry plate photography).
Gelatin dry plate photography dates from the 1870s when silver halide photographic emulsion was hand-poured onto glass plates and allowed to dry prior to use as a negative. The development of dry plate negatives made photography more convenient than the wet plate process of the Civil War era, which required the negative to be exposed and developed onsite. With dry plate photography, the need for a portable darkroom was eliminated, making photography more accessible and allowing more people to become amateur photographers. When Kodak started producing “modern” film by coating flexible celluloid in the late 1800s, the use of glass as a substrate was rendered obsolete. Dry plate photography faded out of common use by the late 1920s.