Lens:

f6.5, 5", Cooke Anastigmat Series IIIA, iris diaphragm to f32. Serial no. 32325 .

Shutter:

Koilos, speeds 1 - 1/300, B, T. Wire release.

Construction:

Leather covered mahogany body, black leather bellows with diagonal corners.

Format:

3 ¼" x 4 ¼" plates held in double dark-slides.

Focusing:

Bellows. Double extension with additional extension by using the front panel struts.

Attributes:

Adams brilliant view-finder. Spirit level. Reversing back. Removable lens panel. Wide-angle flap. Infinity catch.

Identification:

Later type struts. Diagonal cornered bellows. Type 3 front standard lock. Type 3 infinity catch. Early type front standard bolts. Single piece of brass on extension slide. Sliding plate to retain lens panel. Rack and pinion rising front with locking wheel. Type 2 wide-angle rack. Type 2 back catch. "Patents" (upright script) on side strut. Type 5 name plaque.

Movements:

Rising front, tilting front.

Serial Number:

18505 (c. 1909) .

With:

• Focusing screen with removable hood. 2 double dark-slides (1 - 4).
• Houghton Envelope Adapter. Mahogany, 1905 model, marked "Sanderson". Serial no. 1181, 23C.