ここに、私、ハロルド・デニーズ・テイラー（HAROLD DENNIS TAYLOR
）、イギリス女王の臣民で、イングランド王国、ヨーク郡のヨークに住む者が、レンズに関して新たに有用な改良を発明しました。以下はその仕様です。

I get over these difficulties by the simple device of dividing my positive lens into two portions and placing my negative corrector lens be,- tween them, thus forming a triple combination. The above principle of corrections re mains equally in force, as may be gathered from Fig.3, which roughly represents such a triplet lens having its two positive lenses L and L alike in power and shape, but turned in opposite directions.

Having explained as best I can the main principle on which all the lenses described in this specification are based,I should point out that the substantial thicknesses of the lenses,and more especially of the front it necessary to accuracy in estimating their focal powers to make a small reduction for the thickness.

Should glasses of still higher refractive power become available in the future for the positive lenses in conjunction with glasses of still lower ref refractive power for the negative lenses, then a further relaxation of the relative power of the negative lens may become possible, leading to still further improvement.

私、パウル・ルドルフ（PAUL RUDOLPH）、博士、ザクセン＝アルテンブルク公国の臣民であり、ドイツ帝国、ザクセン＝ヴァイマル大公国のイェーナ、カール・ツァイス通りに住む者は、新しいかつ有用な写真用対物レンズを発明しました。以下にその仕様を示します。

The objective described in Patent No. 444,714 and the objective described in Patent No. 660,202 may be considered to have been combined in the present objective. The objective of Patent No. 444,714 is restricted to two groups of cemented lenses separated by the diaphragm, and the opposite effects by which astigmatic correction is obtained are derived solely from the refractive action of cemented surfaces. In the objective of Patent No. 660,202 the said correction is based on the opposite powers of two pairs of facing surfaces, each group of lenses having an airspace between its components. In the new objective the opposite effects producing astigmatic correction are obtained by giving to the power of the cemented surface of the group of lenses in contact the opposite sign to that of the power of the pair of facing surfaces presented by the other group of lenses.

First, a negative cemented surface may be employed, together with a positive pair of facing surfaces, and, secondly, a positive cemented surface with a negative pair of facing surfaces. The first combination leads to a less favorable result; but the second combination, which embodies the present invention, is fruitful in an extraordinary degree. A cemented surface at one side of the diaphragm and a pair of facing surfaces at the other side are well known in objectives, which consist of four components arranged in two groups; but hitherto the power of the cemented surface possessed the same sign as the power of the pair of facing surfaces. In the Petzval objective both have dispersive effect, and the same obtains in Steinheils portraiture antiplanet. The example of the improved objectiveshown in the drawing is described below by exact data as to radii, thicknesses, diaphragm intervals, and glasses employed.

このレンズは、収差を補正した画像面の形成を行うために3群で構成されています。1群は凸レンズで2群は凹レンズ、3群は貼り合わせられた2枚のレンズから成り立っています。

Unsymmetrisches Objektiv. Die bisher bekannten unsymmetrischen Objektive mit anastigmatischer Bildfeldebnung aus drei Gliedern, von denen das erste eine Sammellinse, das zweite eine Zerstreuungslinse ist und das letzte Glied aus zwei miteinander verkitteten Linsen besteht, verwenden im dritten Glied eine verhältnismäßig stark gekrümmte Kittfläche. Abgesehen von den technischen Nachteilen bei der Herstellung wird bei gegebener Dicke der einen Linse auch ihre freie Öffnung durch die starke Krümmung der Kittfläche beschränkt.

非対称型レンズ。今日までに知られているアナスティグマット性能を備えるトリプレットタイプのレンズは3群3枚構成でしたが、このレンズは収差の補正を行うために3群4枚で構成されており、このうち1群は凸レンズ、2群は凹レンズ、3群は2枚のレンズを貼り合わせた構造です。これらのレンズのうち、3群では比較的強く湾曲した貼り合わせレンズが使用されています。この設計において、開放F値は製造時における技術的制約とは別に貼り合わせレンズの強い湾曲によっても制限されます。。

The "Elmar" Anastigmatic F/3.5 Lens 5cm. focus,introduced by us has been specially computed for the Leica camera.It is composed of a dis-symmetrical triplet with a cemented back lens and is corrected in a very high degree within an image field of 48°. It is entirely free from coma and curvature of the image, and does not exhibit any appreciable degree of zonal astigmatism or the slightest degree of distortion.

What I claim as my invention, and desire to secure by Letters Patent, is- A spherically, chromatically and astigmatically corrected objective, consisting of four lenses separated by the diaphragm into two groups each of two lenses, of which groups one includes a pair of facing surfaces and the other a cemented surface, the power of the pair of facing surfaces being negative and that of the cemented surface positive. In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. PAUL RUDOLPH.