Early Landscape Lens without Glass, 1845 onwards

Unsigned, probably France, suitable for a sliding box camera. - Note: The front section is very early, around 1845-1850, with a diameter of 99 mm and an opening of 29.3 mm. The other three diaphragms are made of thick brass, with diameters of 22.5 mm, 17 mm and 2 mm respectively. The latter can also be used as a pinhole diaphragm without a lens. A further diaphragm of 6 mm Ø was added later from thin sheet metal; the plate was firmly mounted on a 95 mm high tube, presumably French, with a screw thread of 101.3 mm Ø. The missing lens was probably a 48 cm Achromat of approx. 90 mm diameter for the full plate format.

布雷克拍品等级是为了方便竞买人判断拍卖品的成色而设置的。布雷克等级用1到6级来标注外观和功能的成色，(从非常好到非常差)。 在目录图册里用括号里的2个数字来表示，前一个数字表示外观成色的级别，后一个数字表示功能成色的级别。如(3/2)表示外观成色是3(满意的)，功能成色2(好)。 成色 定义参照下列标准： 1 - 非常好 (未使用过，没有使用痕迹) 2 - 好 (新，极少的使用痕迹) 3 - 满意的 (普通的使用痕迹) 4 - 及格的 (明显的使用痕迹，某个非主要部件是后配的) 5 - 有缺陷的 (极明显的使用痕迹, 某个主要部件是后配的，功能上有缺陷，需要修理) 6 - 非常差 (严重破损, 缺少重要部件)