Huge Darlot Convertible "Objectif Universel", c. 1866

Engraving: "ANCne Mon Jamin, Darlot, SR Optn, Bte, 14 r. Chapon, Paris", no. 525. Dimensions case (l x w x h): 26 x 20,5 x 14 cm. – An ordinary portrait lens was used by Darlot to develop – with the help of four additional achromatic lenses – a convertible lens with focus range. Additionally, in combination with the original lenses of the portrait lens, a further 6 different focal lengths could be obtained. The components carry the following engravings: Tube "B", "Portrait A", "Portrait B", elements: "32, 44, 55, 60" and one unmarked ring, height of the lens with lens hood 6 ¼ in., Ø 4 in. – Complete with 10 waterhouse stops, lens cap and box. Historical and rare Darlot lens! With original handwritten instructions from the Darlot Company.

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)