The camera was constructed as a vertical format folding camera for postcard-sized (3¼×5½ inch) pictures on 122 roll film (introduced for this camera) and glass plates. A waist-high reflecting finder fitted to the lens shutter assembly is standard on all models. The sequence of models runs in the following series: Model A, B, B2, B3, and B4 plus C all were produced from 1903 - 1915. Model B5 was produced from 1903 to 1912. Early variants were expensive and had, for example, a combination of Kodak Automatic shutter and Rapid Rectilinear lens of Bausch & Lomb. Later moderately priced variants got the Ball Bearing Shutter. Both shutters worked with a pneumatic remote operation or released by a lever. A glass plate adapter was available for the camera. A later expensive variant had a Compound shutter with Zeiss Kodak Anastigmat. As mentioned above a glass plate adapter with a ground glass focusing screen, available as an extra cost accessory, permitted the taking of photographs on glass plates. Eastman Kodak called this accessory the Combination Back. The Kodak catalog price of the back was three dollars and fifty cents. Double plate holders were priced at one dollar each. When introduced, the 3A FPK, fitted with Kodak's top-of-the-line lens plus shutter was priced as high as $78 US dollars. Seventy-eight 1903 dollars placed the 3A FPK in Kodak's top pricing tier and worth $2,924.39 in today’s dollars. The FPK shutter on the model B2 has a 6 1/2 inch focal length, a maximum aperture of US 4 and stops to US 128. The one-speed shutter is about 1/60 of a second and can be set to Timed, Bulb, plus Instant for the pneumatic or lever shutter release. The 3A FPK has a novel quick focusing aid. On the camera bed, opposite the focusing scale, is a metal slide that can be set to various distances. Once this slide is set and engaged, the camera front can be pulled along the track until it comes to a stop. The camera will now be focused on the preset distance. Some references for this information are Scott’s Photographica Collection, Collectiblend.com, and Camerapedia Fandom.