Wide angle photographic lens

Claim 2

A wide angle photographic lens which can be focused by a simple mechanism, comprising: a divergent forward group having a negative meniscus lens component having its convex surface facing the object side; and a convergent rearward group having a diaphragm, a positive lens component disposed forwardly of said diaphragm, a biconcave negative lens component disposed rearwardly of said diaphragm, a positive meniscus lens component having its convex surface facing the image side, all of said lens components of the forward and the rearward groups being fixed with respect to the image plane, and a focusing lens member disposed most adjacent to the image side; said focusing lens member comprising a lens movable in the direction of the optical axis, and focusing being effected by such movement of said movable lens alone.

Claim 3

A wide angle photographic lens according to claim 1, wherein said focusing lens member is a single positive lens movable in the direction of the optical axis.

Claim 4

A wide angle photographic lens according to claim 1, wherein said focusing lens member comprises two positive lenses, one of which is movable in the direction of the optical axis.

Claim 5

A wide angle photographic lens according to claim 1, wherein said focusing lens member has, in succession from the object side, a positive lens and a negative meniscus lens having its convex surface facing the image side, said two lenses being separate from each other, one of said two lenses being movable in the direction of the optical axis.

Claim 6

A wide angle photographic lens which can be focused by a simple mechanism, comprising: a divergent forward group having a negative meniscus lens component with its convex surface facing the object side; and a convergent rearward group having a diaphragm, a positive lens component disposed forwardly of said diaphragm, a biconcave negative lens component disposed rearwardly of said diaphragm, a positive meniscus lens component having its convex surface facing the image side, and a focusing lens member disposed most adjacent to the image side; said focusing lens member comprising a single positive lens movable in the direction of the optical axis, and focusing being effected by such movement of the movable lens alone; and wherein numerical data are as follows: ______________________________________ r.sub.1 = 144.045 d.sub.1 = 7.425 n.sub.1 = 1.50137 ν.sub.1 = 56.5 r.sub.2 = 48.015 d.sub.2 = 33.908 r.sub.3 = 73.755 d.sub.3 = 17.325 n.sub.2 = 1.78797 ν.sub.2 = 47.5 r.sub.4 = -275.468 d.sub.4 = 21.533 r.sub.5 = -62.865 d.sub.5 = 7.425 n.sub.3 = 1.75692 ν.sub.3 = 31.7 r.sub.6 = 132.908 d.sub.6 = 2.871 r.sub.7 = -175.725 d.sub.7 = 1.980 n.sub.4 = 1.7847 ν.sub.4 = 26.1 r.sub.8 = 309.375 d.sub.8 = 9.034 n.sub.5 = 1.78797 ν.sub.5 = 47.5 r.sub.9 = -51.975 d.sub.9 = 9.405 r.sub.10 = 371.25 d.sub.10 = 7.425 n.sub.6 = 1.78797 ν.sub.6 = 47.5 r.sub.11 = -210.798 Back focal length Bf = 98.547 ______________________________________

Claim 7

A wide angle photographic lens which can be focused by a simple mechanism, comprising: a divergent forward group having a negative meniscus lens component with its convex surface facing the object side; and a convergent rearward group having a diaphragm, a positive lens component disposed forwardly of said diaphragm, a biconcave negative lens component disposed rearwardly of said diaphragm, a positive meniscus lens component having its convex surface facing the image side, and a focusing lens member disposed most adjacent to the image side; said focusing lens member comprising a single positive lens movable in the direction of the optical axis, and focusing being effected by such movement of the movable lens alone; and wherein numerical data are as follows: ______________________________________ r.sub.1 = 144.045 d.sub.1 = 7.425 n.sub.1 = 1.50137 ν.sub.1 = 56.5 r.sub.2 = 48.015 d.sub.2 = 33.908 r.sub.3 = 73.755 d.sub.3 = 17.325 n.sub.2 = 1.78797 ν.sub.2 = 47.5 r.sub.4 = -275.468 d.sub.4 = 21.533 r.sub.5 = -62.865 d.sub.5 = 7.425 n.sub.3 = 1.75692 ν.sub.3 = 31.7 r.sub.6 = 132.908 d.sub.6 = 2.871 r.sub.7 = -175.725 d.sub.7 = 1.980 n.sub.4 = 1.7847 ν.sub.4 = 26.1 r.sub.8 = 309.375 d.sub.8 = 9.034 n.sub.5 = 1.78797 ν.sub.5 = 47.5 r.sub.9 = -51.975 d.sub.9 = 9.405 r.sub.10 = 371.25 d.sub.10 = 7.425 n.sub.6 = 1.78797 ν.sub.6 = 47.5 r.sub.11 = -210.798 Back focal length Bf = 98.547 ______________________________________

Claim 8

A wide angle photographic lens which can be focused by a simple mechanism, comprising: a divergent forward group having a negative meniscus lens component with its convex surface facing the object side; and a convergent rearward group having a diaphragm, a positive lens component disposed forwardly of said diaphragm, a biconcave negative lens component disposed rearwardly of said diaphragm, a positive meniscus lens component having its convex surface facing the image side, and a focusing lens member disposed most adjacent to the image side; said focusing lens member comprising a single positive lens movable in the direction of the optical axis, and focusing being effected by such movement of the movable lens alone; and wherein the numerical data are as follows: ______________________________________ r.sub.1 = 379.128 d.sub.1 = 17.122 n.sub.1 = 1.66557 ν.sub.1 = 53.3 r.sub.2 = 1977.151 d.sub.2 = 0.815 r.sub.3 = 203.113 d.sub.3 = 17.937 n.sub.2 = 1.713 ν.sub.2 = 53.9 r.sub.4 = -60.089 d.sub.4 = 13.657 r.sub.5 = -128.617 d.sub.5 = 5.3 n.sub.3 = 1.6968 ν.sub.3 = 55.6 r.sub.6 = 64.003 d.sub.6 = 15.083 r.sub.7 = -247.45 d.sub.7 = 26.906 n.sub.4 = 1.65844 ν.sub.4 = 50.8 r.sub.8 = -2561.328 d.sub.8 = 0.408 r.sub.9 = 157.479 d.sub.9 = 4.484 n.sub.5 = 1.6968 ν.sub.5 = 55.6 r.sub.10 = 93.762 d.sub.10 = 8.969 r.sub.11 = 125.461 d.sub.11 = 31.39 n.sub.6 = 1.7495 ν.sub.6 = 35.0 r.sub.12 = -933.541 d.sub.12 = 8.153 r.sub.13 = -1844.376 d.sub.13 = 20.791 n.sub.7 = 1.56384 ν.sub.7 = 60.8 r.sub.14 = -93.150 d.sub.14 = 19.160 r.sub.15 = -114.145 d.sub.15 = 9.784 n.sub.8 = 1.74443 ν.sub.8 = 49.4 r.sub.16 = -102.73 d.sub.16 = 3.261 n.sub.9 = 1.80518 ν.sub.9 = 25.5 r.sub.17 = -226.659 d.sub.17 = 5.137 r.sub.18 = -696.014 d.sub.18 = 13.860 n.sub.10 = 1.7481 ν.sub.10 = 52.3 r.sub.19 = -92.233 d.sub.19 = 8.153 r.sub.20 = 619.643 d.sub.20 = 15.083 n.sub.11 = 1.6968 ν.sub.11 = 55.6 r.sub.21 = -210.5 Back focal length Bf = 153.847 ______________________________________

Claim 9

A wide angle photographic lens which can be focused by a simple mechanism, comprising: a divergent forward group having a negative meniscus lens component with its convex surface facing the object side; and a convergent rearward group having a diaphragm, a positive lens component disposed forwardly of said diaphragm, a biconcave negative lens component disposed rearwardly of said diaphragm, a positive meniscus lens component having its convex surface facing the image side, and a focusing lens member disposed most adjacent to the image side; said focusing lens member comprising a single positive lens movable in the direction of the optical axis, and focusing being effected by such movement of the movable lens alone; and wherein the numerical data are as follows: ______________________________________ r.sub.1 = 379.128 d.sub.1 = 17.122 n.sub.1 = 1.66557 ν.sub.1 = 53.3 r.sub.2 = 1977.151 d.sub.2 = 0.815 r.sub.3 = 203.113 d.sub.3 = 17.937 n.sub.2 = 1.713 ν.sub.2 = 53.9 r.sub.4 = -60.089 d.sub.4 = 13.657 r.sub.5 = -128.617 d.sub.5 = 5.3 n.sub.3 = 1.6968 ν.sub.3 = 55.6 r.sub.6 = 64.003 d.sub.6 = 15.083 r.sub.7 = -247.45 d.sub.7 = 26.906 n.sub.4 = 1.65844 ν.sub.4 = 50.8 r.sub.8 = -2561.328 d.sub.8 = 0.408 r.sub.9 = 157.479 d.sub.9 = 4.484 n.sub.5 = 1.6968 ν.sub.5 = 55.6 r.sub.10 = 93.762 d.sub.10 = 8.969 r.sub.11 = 125.461 d.sub.11 = 31.39 n.sub.6 = 1.7495 ν.sub.6 = 35.0 r.sub.12 = -933.541 d.sub.12 = 8.153 r.sub.13 = -1844.376 d.sub.13 = 20.791 n.sub.7 = 1.56384 ν.sub.7 = 60.8 r.sub.14 = -93.150 d.sub.14 = 19.160 r.sub.15 = -114.145 d.sub.15 = 9.784 n.sub.8 = 1.74443 ν.sub.8 = 49.4 r.sub.16 = -102.73 d.sub.16 = 3.261 n.sub.9 = 1.80518 ν.sub.9 = 25.5 r.sub.17 = -226.659 d.sub.17 = 5.137 r.sub.18 = -696.014 d.sub.18 = 13.860 n.sub.10 = 1.7481 ν.sub.10 = 52.3 r.sub.19 = -92.233 d.sub.19 = 8.153 r.sub.20 = 619.643 d.sub.20 = 15.083 n.sub.11 = 1.6968 ν.sub.11 = 55.6 r.sub.21 = -210.5 Back focal length Bf = 153.847 ______________________________________

Claim 10

A wide angle photographic lens which can be focused by a simple mechanism, comprising: a divergent forward group having a negative meniscus lens component with its convex surface facing the object side; and a convergent rearward group having a diaphragm, a positive lens component disposed forwardly of said diaphragm, a biconcave negative lens component disposed rearwardly of said diaphragm, a positive meniscus lens component having its convex surface facing the image side, and a focusing lens member disposed most adjacent to the image side; said focusing lens member comprising two positive lenses, one of which is movable in the direction of the optical axis, and focusing being effected by such movement of said movable lens alone; and wherein numerical data are as follows: ______________________________________ r.sub.1 = 173.61 d.sub.1 = 8.33 n.sub.1 = 1.5168 ν.sub.1 = 64.2 r.sub.2 = 48.89 d.sub.2 = 35.56 r.sub.3 = 75.0 d.sub.3 = 13.89 n.sub.2 = 1.80279 ν.sub.2 = 46.8 r.sub.4 = -277.78 d.sub.4 = 21.94 r.sub.5 = -65.56 d.sub.5 = 6.39 n.sub.3 = 1.74 ν.sub.3 = 28.2 r.sub.6 = 126.1 d.sub.6 = 2.33 r.sub.7 = -213.89 d.sub.7 = 9.53 n.sub.4 = 1.62041 ν.sub.4 = 60.3 r.sub.8 = -52.78 d.sub.8 = 10.555 r.sub.9 = -833.33 d.sub.9 = 6.67 n.sub.5 = 1.713 ν.sub.5 = 53.9 r.sub.10 = -125.0 d.sub.10 = 0.28 r.sub.11 = -1250.0 d.sub.11 = n.sub.6 = 1.67025 ν.sub.6 = 57.5 r.sub.12 = -203.46 Back focal length Bf = 102.83 f' = 485.9 f" = 139.33 ______________________________________

Claim 11

A wide angle photographic lens which can be focused by a simple mechanism, comprising: a divergent forward group having a negative meniscus lens component with its convex surface facing the object side; and a convergent rearward group having a diaphragm, a positive lens component disposed forwardly of said diaphragm, a biconcave negative lens component disposed rearwardly of said diaphragm, a positive meniscus lens component having its convex surface facing the image side, and a focusing lens member disposed most adjacent to the image side; said focusing lens member comprising two positive lenses, one of which is movable in the direction of the optical axis, and focusing being effected by such movement of said movable lens alone; and wherein numerical data are as follows: ______________________________________ r.sub.1 = 173.61 d.sub.1 = 8.33 n.sub.1 = 1.5168 ν.sub.1 = 64.2 r.sub.2 = 48.89 d.sub.2 = 35.56 r.sub.3 = 75.0 d.sub.3 = 13.89 n.sub.2 = 1.80279 ν.sub.2 = 46.8 r.sub.4 = -277.78 d.sub.4 = 21.94 r.sub.5 = -65.56 d.sub.5 = 6.39 n.sub.3 = 1.74 ν.sub.3 = 28.2 r.sub.6 = 126.1 d.sub.6 = 2.33 r.sub.7 = -213.89 d.sub.7 = 9.53 n.sub.4 = 1.62041 ν.sub.4 = 60.3 r.sub.8 = -52.78 d.sub.8 = 10.555 r.sub.9 = -833.33 d.sub.9 = 6.67 n.sub.5 = 1.713 ν.sub.5 = 53.9 r.sub.10 = -125.0 d.sub.10 = 0.28 r.sub.11 = -1250.0 d.sub.11 = n.sub.6 = 1.67025 ν.sub.6 = 57.5 r.sub.12 = -203.46 Back focal length Bf = 102.83 f' = 485.9 f" = 139.33 ______________________________________

Claim 12

A wide angle photographic lens which can be focused by a simple mechanism, comprising: a divergent forward group having a negative meniscus lens component with its convex surface facing the object side; and a convergent rearward group having a diaphragm, a positive lens component disposed forwardly of said diaphragm, a biconcave negative lens component disposed rearwardly of said diaphragm, a positive meniscus lens component having its convex surface facing the image side, and a focusing lens member disposed most adjacent to the image side; said focusing lens member comprising two positive lenses, one of which is movable in the direction of the optical axis, and focusing being effected by such movement of said movable lens alone; and wherein numerical data are as follows: ______________________________________ r.sub.1 = 241.21 d.sub.1 = 8.04 n.sub.1 = 1.5168 ν.sub.1 = 64.2 r.sub.2 = 53.77 d.sub.2 = 50.75 r.sub.3 = 96.73 d.sub.3 = 28.14 n.sub.2 = 1.78797 ν.sub.2 = 47.5 r.sub.3' = -140.70 d.sub.3' = 7.54 n.sub.2' = 1.7552 ν.sub.2' = 27.5 r.sub.4 = -189.45 d.sub.4 = 33.17 r.sub.5 = -66.13 d.sub.5 = 2.51 n.sub.3 = 1.7847 ν.sub.3 = 26.1 r.sub.6 = 192.46 d.sub.6 = 3.79 r.sub.7 = -213.57 d.sub.7 = 2.01 n.sub.4 = 1.79504 ν.sub.4 = 28.4 r.sub.7' = -5025.13 d.sub.7' = 9.55 n.sub.4' = 1.78797 ν.sub. 4' = 47.5 r.sub.8 = -67.84 d.sub.8 = 9.045 r.sub.9 = -3208.54 d.sub.9 = 7.04 n.sub.5 = 1.84042 ν.sub.5 = 43.3 r.sub.10 = -154.02 d.sub.10 = 0.25 r.sub.11 = 1469.85 d.sub.11 = 5.53 n.sub.6 = 1.84042 ν.sub.6 = 43.3 r.sub.12 = -500.65 Back focal length Bf = 102.19 ______________________________________

Claim 13

A wide angle photographic lens which can be focused by a simple mechanism, comprising: a divergent forward group having a negative meniscus lens component with its convex surface facing the object side; and a convergent rearward group having a diaphragm, a positive lens component disposed forwardly of said diaphragm, a biconcave negative lens component disposed rearwardly of said diaphragm, a positive meniscus lens component having its convex surface facing the image side, and a focusing lens member disposed most adjacent to the image side; said focusing lens member comprising two positive lenses, one of which is movable in the direction of the optical axis, and focusing being effected by such movement of said movable lens alone; and wherein numerical data are as follows: ______________________________________ r.sub.1 = 241.21 d.sub.1 = 8.04 n.sub.1 = 1.5168 ν.sub.1 = 64.2 r.sub.2 = 53.77 d.sub.2 = 50.75 r.sub.3 = 96.73 d.sub.3 = 28.14 n.sub.2 = 1.78797 ν.sub.2 = 47.5 r.sub.3' = -140.70 d.sub.3' = 7.54 n.sub.2' = 1.7552 ν.sub.2' = 27.5 r.sub.4 = -189.45 d.sub.4 = 33.17 r.sub.5 = -66.13 d.sub.5 = 2.51 n.sub.3 = 1.7847 ν.sub.3 = 26.1 r.sub.6 = 192.46 d.sub.6 = 3.79 r.sub.7 = -213.57 d.sub.7 = 2.01 n.sub.4 = 1.79504 ν.sub.4 = 28.4 r.sub.7' = -5025.13 d.sub.7' = 9.55 n.sub.4' = 1.78797 ν.sub. 4' = 47.5 r.sub.8 = -67.84 d.sub.8 = 9.045 r.sub.9 = -3208.54 d.sub.9 = 7.04 n.sub.5 = 1.84042 ν.sub.5 = 43.3 r.sub.10 = -154.02 d.sub.10 = 0.25 r.sub.11 = 1469.85 d.sub.11 = 5.53 n.sub.6 = 1.84042 ν.sub.6 = 43.3 r.sub.12 = -500.65 Back focal length Bf = 102.19 ______________________________________

Claim 14

A wide angle photographic lens which can be focused by a simple mechanism, comprising: a divergent forward group having a negative meniscus lens component with its convex surface facing the object side; and a convergent rearward group having a diaphragm, a positive lens component disposed forwardly of said diaphragm, a biconcave negative lens component disposed rearwardly of said diaphragm, a positive meniscus lens component having its convex surface facing the image side, and a focusing lens member disposed most adjacent to the image side; said focusing lens member comprising two positive lenses, one of which is movable in the direction of the optical axis, and focusing being effected by such movement of said movable lens alone; and wherein numerical data are as follows: ______________________________________ r.sub.1 = 239.27 d.sub.1 = 8.38 n.sub.1 = 1.51824 ν.sub.1 = 60.3 r.sub.2 = 54.19 d.sub.2 = 51.57 r.sub.3 = 97.91 d.sub.3 = 30.63 n.sub.2 = 1.78797 ν.sub.2 = 47.5 r.sub.3' = -141.36 d.sub.3' = 7.33 n.sub.2' = 1.7552 ν.sub.2' = 27.5 r.sub.4 = -186.7 d.sub.4 = 33.25 r.sub.5 = -66.99 d.sub.5 = 3.14 n.sub.3 = 1.7847 ν.sub.3 = 26.1 r.sub.6 = 195.03 d.sub.6 = 3.9 r.sub.7 = -195.55 d.sub.7 = 2.09 n.sub.4 = 1.7847 ν.sub.4 = 26.1 r.sub.7' = -∞ d.sub.7' = 7.85 n.sub.4' = 1.80218 ν.sub. 4' = 44.7 r.sub.8 = -69.37 d.sub.8 = 9.686 r.sub.9 = -3259.16 d.sub.9 = 7.07 n.sub.5 = 1.84042 ν.sub.5 = 43.3 r.sub.10 = -156.55 d.sub.10 = 0.26 r.sub.11 = 1492.15 d.sub.11 = 5.76 n.sub.6 = 1.84042 ν.sub.6 = 43.3 r.sub.12 = -406.85 Back focal length Bf = 101.05 ______________________________________

Claim 15

A wide angle photographic lens which can be focused by a simple mechanism, comprising: a divergent forward group having a negative meniscus lens component with its convex surface facing the object side; and a convergent rearward group having a diaphragm, a positive lens component disposed forwardly of said diaphragm, a biconcave negative lens component disposed rearwardly of said diaphragm, a positive meniscus lens component having its convex surface facing the image side, and a focusing lens member disposed most adjacent to the image side; said focusing lens member comprising two positive lenses, one of which is movable in the direction of the optical axis, and focusing being effected by such movement of said movable lens alone; and wherein numerical data are as follows: ______________________________________ r.sub.1 = 239.27 d.sub.1 = 8.38 n.sub.1 = 1.51824 ν.sub.1 = 60.3 r.sub.2 = 54.19 d.sub.2 = 51.57 r.sub.3 = 97.91 d.sub.3 = 30.63 n.sub.2 = 1.78797 ν.sub.2 = 47.5 r.sub.3' = -141.36 d.sub.3' = 7.33 n.sub.2' = 1.7552 ν.sub.2' = 27.5 r.sub.4 = -186.7 d.sub.4 = 33.25 r.sub.5 = -66.99 d.sub.5 = 3.14 n.sub.3 = 1.7847 ν.sub.3 = 26.1 r.sub.6 = 195.03 d.sub.6 = 3.9 r.sub.7 = -195.55 d.sub.7 = 2.09 n.sub.4 = 1.7847 ν.sub.4 = 26.1 r.sub.7' = -∞ d.sub.7' = 7.85 n.sub.4' = 1.80218 ν.sub. 4' = 44.7 r.sub.8 = -69.37 d.sub.8 = 9.686 r.sub.9 = -3259.16 d.sub.9 = 7.07 n.sub.5 = 1.84042 ν.sub.5 = 43.3 r.sub.10 = -156.55 d.sub.10 = 0.26 r.sub.11 = 1492.15 d.sub.11 = 5.76 n.sub.6 = 1.84042 ν.sub.6 = 43.3 r.sub.12 = -406.85 Back focal length Bf = 101.05 ______________________________________

Claim 16

A wide angle photographic lens which can be focused by a simple mechanism, comprising: a divergent forward group having a negative meniscus lens component with its convex surface facing the object side; and a convergent rearward group having a diaphragm, a positive lens component disposed forwardly of said diaphragm, a biconcave negative lens component disposed rearwardly of said diaphragm, a positive meniscus lens component having its convex surface facing the image side, and a focusing lens member disposed most adjacent to the image side; said focusing member comprising, in succession from the object side, a positive lens and a negative meniscus lens having its convex surface facing the image side, said two lenses being separate from each other and one of said two lenses being movable in the direction of the optical axis, and focusing being effected by such movement of said one movable lens alone; and wherein numerical data are as follows: ______________________________________ r.sub.1 = 187.0 d.sub.1 = 19.58 n.sub.1 = 1.50032 ν.sub.1 = 81.9 r.sub.2 = 490.62 d.sub.2 = 0.35 r.sub.3 = 130.86 d.sub.3 = 3.50 n.sub.2 = 1.50032 ν.sub.2 = 81.9 r.sub.4 = 59.09 d.sub.4 = 20.63 r.sub.5 = 143.36 d.sub.5 = 3.85 n.sub.3 = 1.60729 ν.sub.3 = 59.5 r.sub.6 = 50.35 d.sub.6 = 20.98 r.sub.7 = 1398.60 d.sub.7 = 13.99 n.sub.4 = 1.77279 ν.sub.4 = 49.4 r.sub.8 = 67.13 d.sub.8 = 34.97 n.sub.5 = 1.62004 ν.sub.5 = 36.3 r.sub.9 = -274.91 d.sub.9 = 0.35 r.sub.10 = 103.15 d.sub.10 = 37.76 n.sub.6 = 1.58913 ν.sub. 6 = 61.2 r.sub.11 = -101.05 d.sub.11 = 11.89 r.sub.12 = -70.28 d.sub.12 = 14.69 n.sub.7 = 1.75692 ν.sub.7 = 31.7 r.sub.13 = 178.32 d.sub.13 = 1.71 r.sub.14 = -335.66 d.sub.14 = 8.39 n.sub.8 = 1.62299 ν.sub.8 = 58.1 r.sub.15 = -69.23 d.sub.15 = 6.99 r.sub.16 = -839.16 d.sub.16 = 10.49 n.sub.9 = 1.6228 ν.sub.9 = 56.9 r.sub.17 = -69.93 d.sub.17 = 0.35 r.sub.18 = -73.43 d.sub.18 = 3.50 n.sub.10 = 1.62588 ν.sub.10 = 35.6 r.sub.19 = -86.73 Back focal length Bf = 167.24 f' = -670.42 f" = 82.17 ______________________________________

Claim 17

A wide angle photographic lens which can be focused by a simple mechanism, comprising: a divergent forward group having a negative meniscus lens component with its convex surface facing the object side; and a convergent rearward group having a diaphragm, a positive lens component disposed forwardly of said diaphragm, a biconcave negative lens component disposed rearwardly of said diaphragm, a positive meniscus lens component having its convex surface facing the image side, and a focusing lens member disposed most adjacent to the image side; said focusing member comprising, in succession from the object side, a positive lens and a negative meniscus lens having its convex surface facing the image side, said two lenses being separate from each other and one of said two lenses being movable in the direction of the optical axis, and focusing being effected by such movement of said one movable lens alone; and wherein numerical data are as follows: ______________________________________ r.sub.1 = 187.0 d.sub.1 = 19.58 n.sub.1 = 1.50032 ν.sub.1 = 81.9 r.sub.2 = 490.62 d.sub.2 = 0.35 r.sub.3 = 130.86 d.sub.3 = 3.50 n.sub.2 = 1.50032 ν.sub.2 = 81.9 r.sub.4 = 59.09 d.sub.4 = 20.63 r.sub.5 = 143.36 d.sub.5 = 3.85 n.sub.3 = 1.60729 ν.sub.3 = 59.5 r.sub.6 = 50.35 d.sub.6 = 20.98 r.sub.7 = 1398.60 d.sub.7 = 13.99 n.sub.4 = 1.77279 ν.sub.4 = 49.4 r.sub.8 = 67.13 d.sub.8 = 34.97 n.sub.5 = 1.62004 ν.sub.5 = 36.3 r.sub.9 = -274.91 d.sub.9 = 0.35 r.sub.10 = 103.15 d.sub.10 = 37.76 n.sub.6 = 1.58913 ν.sub. 6 = 61.2 r.sub.11 = -101.05 d.sub.11 = 11.89 r.sub.12 = -70.28 d.sub.12 = 14.69 n.sub.7 = 1.75692 ν.sub.7 = 31.7 r.sub.13 = 178.32 d.sub.13 = 1.71 r.sub.14 = -335.66 d.sub.14 = 8.39 n.sub.8 = 1.62299 ν.sub.8 = 58.1 r.sub.15 = -69.23 d.sub.15 = 6.99 r.sub.16 = -839.16 d.sub.16 = 10.49 n.sub.9 = 1.6228 ν.sub.9 = 56.9 r.sub.17 = -69.93 d.sub.17 = 0.35 r.sub.18 = -73.43 d.sub.18 = 3.50 n.sub.10 = 1.62588 ν.sub.10 = 35.6 r.sub.19 = -86.73 Back focal length Bf = 167.24 f' = -670.42 f" = 82.17 ______________________________________

Claim 18

A wide angle photographic lens which can be focused by a simple mechanism, comprising: a divergent forward group having a negative meniscus lens component with its convex surface facing the object side; and a convergent rearward group having a diaphragm, a positive lens component disposed forwardly of said diaphragm, a biconcave negative lens component disposed rearwardly of said diaphragm, a positive meniscus lens component having its convex surface facing the image side, and a focusing lens member disposed most adjacent to the image side; said focusing member comprising, in succession from the object side, a positive lens and a negative meniscus lens having its convex surface facing the image side, said two lenses being separate from each other and one of said two lenses being movable in the direction of the optical axis, and focusing being effected by such movement of said one movable lens alone; and wherein numerical data are as follows: ______________________________________ r.sub.1 = 172.78 d.sub.1 = 5.0 n.sub.1 = 1.51835 ν.sub.1 = 60.3 r.sub.2 = 48.61 d.sub.2 = 33.89 r.sub.3 = 73.33 d.sub.3 = 17.22 n.sub.2 = 1.74443 ν.sub.2 = 49.4 r.sub.4 = -249.72 d.sub.4 = 24.17 r.sub.5 = -59.44 d.sub.5 = 8.61 n.sub.3 = 1.74077 ν.sub.3 = 27.7 r.sub.6 = 142.78 d.sub.6 = 3.47 r.sub.7 = -172.22 d.sub.7 = 9.44 n.sub.4 = 1.713 ν.sub.4 = 53.9 r.sub.8 = -52.78 d.sub.8 = 0.28 r.sub.9 = 277.78 d.sub.9 = 11.11 n.sub.5 = 1.713 ν.sub.5 = 53.9 r.sub.10 = -97.22 d.sub.10 = 0.28 r.sub.11 = -125.0 d.sub.11 = n.sub.6 = 1.713 ν.sub.6 = 53.9 r.sub.12 = -212.5 Back focal length Bf = 105.89 f' = 79.6 ______________________________________

Claim 19

A wide angle photographic lens which can be focused by a simple mechanism, comprising: a divergent forward group having a negative meniscus lens component with its convex surface facing the object side; and a convergent rearward group having a diaphragm, a positive lens component disposed forwardly of said diaphragm, a biconcave negative lens component disposed rearwardly of said diaphragm, a positive meniscus lens component having its convex surface facing the image side, and a focusing lens member disposed most adjacent to the image side; said focusing member comprising, in succession from the object side, a positive lens and a negative meniscus lens having its convex surface facing the image side, said two lenses being separate from each other and one of said two lenses being movable in the direction of the optical axis, and focusing being effected by such movement of said one movable lens alone; and wherein numerical data are as follows: ______________________________________ r.sub.1 = 172.78 d.sub.1 = 5.0 n.sub.1 = 1.51835 ν.sub.1 = 60.3 r.sub.2 = 48.61 d.sub.2 = 33.89 r.sub.3 = 73.33 d.sub.3 = 17.22 n.sub.2 = 1.74443 ν.sub.2 = 49.4 r.sub.4 = -249.72 d.sub.4 = 24.17 r.sub.5 = -59.44 d.sub.5 = 8.61 n.sub.3 = 1.74077 ν.sub.3 = 27.7 r.sub.6 = 142.78 d.sub.6 = 3.47 r.sub.7 = -172.22 d.sub.7 = 9.44 n.sub.4 = 1.713 ν.sub.4 = 53.9 r.sub.8 = -52.78 d.sub.8 = 0.28 r.sub.9 = 277.78 d.sub.9 = 11.11 n.sub.5 = 1.713 ν.sub.5 = 53.9 r.sub.10 = -97.22 d.sub.10 = 0.28 r.sub.11 = -125.0 d.sub.11 = n.sub.6 = 1.713 ν.sub.6 = 53.9 r.sub.12 = -212.5 Back focal length Bf = 105.89 f' = 79.6 ______________________________________

Claim 20

A wide angle photographic lens which can be focused by a simple mechanism, comprising: a divergent forward group having a negative meniscus lens having its convex surface facing the object side; and a convergent rearward group having in succession from the object side, a positive lens, a diaphram, a biconcave lens, a positive meniscus lens having its convex surface facing the image side, and a biconvex positive lens, the biconvex positive lens being a focusing member and being movable in the direction of the optical axis, focusing being effected by the movement of said biconvex positive lens while the other lenses are maintained fixed with respect to the image plane, thereby enabling good correction of aberrations at short object distances.

Claim 21

A wide angle photographic lens which can be focused by a simple mechanism, comprising: a divergent forward group having a negative meniscus lens having its convex surface facing the object side; and a convergent rearward group having in succession from the object side, a positive lens, a diaphram, a biconcave lens, a positive meniscus lens having its convex surface facing the image side, and a biconvex positive lens, the biconvex positive lens being a focusing member and being movable in the direction of the optical axis, focusing being effected by the movement of said biconvex positive lens while the other lenses are maintained fixed with respect to the image plane, thereby enabling good correction of aberrations at short object distances.

Claim 22

A wide angle photographic lens according to claim 12, wherein said positive meniscus lens consists of a doublet.

Claim 23

A wide angle photographic lens according to claim 13, wherein numerical data are as follows: ______________________________________ r.sub.1 = 144.045 d.sub.1 = 7.425 n.sub.1 = 1.50137 ν.sub.1 = 56.5 r.sub.2 = 48.015 d.sub.2 = 33.908 r.sub.3 = 73.755 d.sub.3 = 17.325 n.sub.2 = 1.78797 ν.sub.2 = 47.5 r.sub.4 = -275.468 d.sub.4 = 21.533 r.sub.5 = -62.865 d.sub.5 = 7.425 n.sub.3 = 1.75692 ν.sub.3 = 31.7 r.sub.6 = 132.908 d.sub.6 = 2.871 r.sub.7 = -175.725 d.sub.7 = 1.980 n.sub.4 = 1.7847 ν.sub.4 = 26.1 r.sub.8 = 309.375 d.sub.8 = 9.034 n.sub.5 = 1.78797 ν.sub.5 = 47.5 r.sub.9 = -51.975 d.sub.9 = 9.405 r.sub.10 = 371.25 d.sub.10 = 7.425 n.sub.6 = 1.78797 ν.sub.6 = 47.5 r.sub.11 = -210.798 Back focal length Bf = 98.547 ______________________________________