9 Unmarked Brass Lenses, 1865–1890

1) Wide-angle lens with focal length of approx. 25 cm, rotating stop, height 2 ¾ in., Ø 2 ¾ in., connecting ring, excellent condition. – 2) Petzval-type lens, focal length of approx. 24 cm, for waterhouse stop, height 6 ¼ in., front element 2 1/3 in., rack-and-pinion focusing, connecting ring Ø 4 1/3 in. – 3) Portrait lens with focal length of approx. 25 cm, for waterhouse stop, height 6 ¼ in., front element 2 ½ in., rack-and-pinion focusing. – 4) Portrait and landscape lens, focal length of approx. 14 cm, presumably French, for waterhouse stop, height 4 1/3 in., front element approx. 1 3/5 in., connecting ring Ø 3 1/6 in. – 5) Portrait lens with focal length of approx. 15 cm, not for waterhouse stop, height 4 ¾ in., Ø 2 1/3 in., rack-and-pinion focusing. – 6) Small wide-angle lens, mounted on lens board, focal length of approx. 12 cm, rotating stop, height ¾ in. – And: 7–9) 3 brass lenses, partially complete. – Mixed condition.

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)