DE1707079U - WIDE ANGLE PHOTOGRAPHIC OR KINEMATOGRAPHIC LENS. - Google Patents

Description

Joe. Schneider & Co., Optische Werke, Kreuznach / fchldV "Photographi aches or cinematographi aches wide-angle lens."

The invention relates to a photographic or cinematographic wide-angle lens consisting of four non-cemented members standing individually in the air, a negative meaiscus in front of an image-side consisting of two positive members and a biconcave negative lens enclosed between these on the side of the longer beam width, a negative meaiscus, aeT its hollow The line surface faces this 5-part system part and is separated from it by an air gap that is at least 50 pounds of the overall length of the overall system. In order to achieve a good overall correction, it has already been suggested that all lenses of such a system should be constructed with a higher refractive index than 1.62 for the yellow helium line of the spectrum.

Such wide-angle lenses could be created with a relative aperture value of about Ii 4 with sufficient correction. As a result of the distribution of the refractive power in the individual system elements, it was also achieved that the focal length - i.e. the distance from the last system surface to the image plane - is greater than the total focal length of the lens. As a result, such a system is suitable for certain linear building purposes, ζ .3. as an interchangeable lens for cameras with a shutter attached, particularly suitable «

What is new about the invention compared to similar systems of this type is that the air gap between the negative meniscus on the object side and the lens surface of the anterior positive eyelet of the image-side triplet facing it is between 70 and 80 "of the total focal length of the system and that, at the same time, Sadius is the anterior convex lens surface of the object-side legative surface is greater than the total focal length, but does not exceed 120 i * of the same, while the hadius of the subsequent concave liixaen surface of this meniscus

kus is between Ι4Ο and 180 H of the length of the radius it is turned into in the positive anterior segment of the triplet on the image side.

Furthermore, a built-up device according to the invention is characterized System by such a distribution of the Breehkraften in the two front system elements separated by the large air gap, that the refractive index of the glass of the front lens iai The triplet on the picture side is greater than 1.73 and between this and that of the object-side meniscus a difference of about 0.1 consists.

The following numerical example shows the structural data a constructed according to the invention wide-angle object j ekti ve s the Light intensity 1: 4 * 0 and a focal length f '= 100;

Numerical example

^Γ 2 f ^f = s 100 SBtt S * β 104.3 am 1 «+ 110.53
= + 71.40 ^{λ Ä} 8.35 1.54250 58, d ₂ = 75.22 Air gap , 7 ν »+ 44.66
= - 3768.14 ³ = 8.13 1.74400 44 ^r 5
^r 6 ^d 4 = 8.44 Air gap ,1 = - 50.67
= + 48.44 ⁵ «1.51 1.66680 33 * 7 d ₆ = 6.65 Air gap »4 H * - + 451.39
^d 7
«- 39.27 ' ^s 5.78 1.65160 58 = 114.08

In accordance with the drawing, L, - L _{denote the four lenses of the system, Γ χ} - * v _Q the hadia and S ₁ - d the lens thickness a and distance between the system membersa «

3 ah ut ζ claims marriage :

Claims (1)

54069 * 6/25/55, ■ k S chut a talks: 1) Photographer! Aches or cinematographic wide-angle lens aas four individually standing in the air and not cemented members, with one image-side, consisting of two positive members and a biconcave negative lens enclosed between them on the side of the longer beam distance ^: Wi & ^ & e ^ sttiv ^ ar Me £ iÄKS is provided, ordinate, which faces its hollow lens surface ό) s of this 5-part system part and is separated from it by an air gap that is at least 50 £ of the overall length of the overall system, and with all lenses of the system aas There are glasses with a higher refractive index than 1.62 for the yellow helium line of the spectrum, characterized in that the air gap (d_) between the. object-present negative meniscus (L-) and the facing lens surface (r_) of the front positive lens (L ₂ ) of the image-side triplet (L _?, L_, L} between 70 and 80 iü of the total focal length (f) of the system and that at the same time the radius of the anterior convex lens surface Cr ₁ ) of the ob ^ ect-side segment of the segment is greater than the total focal length, but does not exceed 120% of the same, while the Eadias of the following concave lens surface OO of this meniscus between 140 and ISO $ the length of the ihsi inverted Hadius (r ~) is the positive part of the image-sided triplet is 2 * 5 photographic or kinematographic wide-angle lens aacfa claim 1, characterized by such a distribution of the refractive powers in the two front system members (L ₁ and L ^) separated by the large air gap (d) that the refractive index (a _d ) des Glass of the front lens (L ₂ ) generally the image-side triplet (L ₃ , L, L ^) is greater than 1.73 and there is a difference of about 0.1 between this and that of the object-side seniscus. 3.) Phot ographi sohe s or kineaat ographi ache a wide-angle lens according to claims 1 and 2, characterized by the following systeaaafbaa, based on a focal length f = 100: Numerical example f '«100 ma s <» 104.8 mn * * + 110.53 ° d ^X d. * 8.55 1.64250 58.1 r _o -> 71.40 d »75.22 air gap »- 3768.14» - 50.67 r_ = + 44.66,
⁷ d_ * 8.13 1.74400 44.7 d * 8.44 air tab stand ^J d- «1.51 1.66680 33.1 r _g = + 48.44 ⁵ , dg = 6.65 clearance r_ = + 451.39 *. ^r d - 5.78 1.65160 58.4 t «114.08