These lenses are considerably reduced values of spherical aberration, coma and chromatic aberration. Best used to replace single components where performance must be improved.
| Specifications | |
| Material | Optical glass, Crystal, Sapphire |
| Dimension Tolerance | +/-0.05mm |
| Centration | 3 arc minutes |
| Clear Aperture | >95% |
| Surface Figure | 1/4 wave @632.8nm |
| Surface Quality | 10-5 scratch and dig |
| Bevel | 0.1mmX45 degree |
| Coating | None, AR, AL... |
| Dia. (mm) | E.F.L. (mm) |
Radius R1 (mm) |
R2=R3 (mm) |
Radius R4 (mm) |
C.T.1 (mm) |
C.T.2 (mm) |
Glass Type | Item number |
| 3.0 | 3.95 | 3.16 | -2.23 | -7.88 | 2.0 | 1.0 | BaFN10-FD10 | ESA-001 |
| 3.0 | 4.50 | 3.16 | -2.23 | -7.88 | 2.0 | 1.0 | LakN22-SFL6 | ESA-002 |
| 3.0 | 6.00 | 4.13 | -2.36 | -21.70 | 2.0 | 1.0 | BaF10-FD10 | ESA-003 |
| 3.0 | 9.00 | 5.26 | -3.98 | -12.05 | 1.5 | 1.0 | BK7-SF5 | ESA-004 |
| 3.0 | 12.00 | 7.39 | -5.15 | -14.62 | 1.7 | 1.0 | BK7-SF5 | ESA-005 |
| 4.0 | 8.00 | 5.76 | -3.49 | -26.05 | 1.5 | 1.0 | BaF10-FD10 | ESA-006 |
| 5.0 | 7.50 | 5.56 | -3.09 | -18.25 | 3.7 | 1.0 | BaF10-FD10 | ESA-007 |
| 5.0 | 7.61 | 4.84 | -3.00 | -16.67 | 2.7 | 1.0 | SK16-SF10 | ESA-008 |
| 5.0 | 10.00 | 7.17 | -4.39 | -33.96 | 1.7 | 1.0 | BaF10-FD10 | ESA-009 |
| 5.0 | 15.00 | 10.67 | -6.46 | -53.57 | 1.6 | 1.0 | BaF10-FD10 | ESA-010 |
| 6.0 | 20.00 | 12.02 | -7.45 | -28.97 | 2.9 | 1.3 | BK7-F2 | ESA-011 |
| 6.0 | 25.00 | 15.37 | -11.16 | -32.17 | 2.3 | 0.9 | BK7-SF5 | ESA-012 |
| 6.3 | 10.00 | 6.98 | -4.35 | -41.01 | 3.1 | 1.0 | BaF10-FD10 | ESA-013 |
| 6.3 | 12.50 | 8.63 | -5.29 | -51.17 | 3.0 | 0.8 | BaF10-FD10 | ESA-014 |
| 6.3 | 15.00 | 7.95 | -7.25 | -277.83 | 2.7 | 0.6 | SSKN8-FD10 | ESA-015 |
| 6.3 | 20.00 | 12.30 | -8.71 | -24.98 | 2.7 | 0.9 | BK7-SF5 | ESA-016 |
| 6.3 | 25.00 | 15.37 | -11.16 | -32.17 | 2.3 | 0.9 | BK7-SF5 | ESA-017 |
| 6.3 | 30.00 | 18.11 | -13.51 | -39.29 | 2.3 | 0.9 | BK7-SF5 | ESA-018 |
| 6.3 | 35.00 | 23.14 | -14.51 | -38.86 | 2.3 | 0.9 | BK7-SF5 | ESA-019 |
| 6.3 | 40.00 | 25.05 | -17.27 | -49.33 | 2.3 | 1.0 | BK7-SF5 | ESA-020 |
| 6.3 | 50.00 | 30.77 | -22.05 | -64.60 | 2.0 | 1.0 | BK7-SF5 | ESA-021 |
| 6.3 | 60.00 | 37.16 | -26.28 | -76.48 | 2.3 | 1.0 | BK7-SF5 | ESA-022 |
| 8.0 | 25.00 | 16.53 | -10.88 | -39.80 | 2.6 | 2.5 | SK11-SF5 | ESA-023 |
| 9.0 | 12.00 | 8.37 | -7.01 | -26.18 | 5.0 | 2.0 | BaFN10/SF57 | ESA-024 |
| 9.0 | 18.00 | 12.37 | -7.38 | -73.86 | 4.3 | 1.2 | BaF10-FD10 | ESA-025 |
| 9.0 | 27.00 | 15.36 | -12.01 | -39.56 | 3.9 | 1.3 | BK7-SF5 | ESA-026 |
| 9.0 | 36.00 | 22.16 | -15.98 | -46.14 | 2.5 | 1.5 | BK7-SF5 | ESA-027 |
| 9.0 | 40.00 | 24.77 | -18.01 | -51.17 | 3.7 | 1.3 | BK7-SF5 | ESA-028 |
| 9.0 | 45.00 | 27.83 | -19.75 | -57.06 | 3.0 | 1.3 | BK7-SF5 | ESA-029 |
| 9.0 | 60.00 | 36.51 | -26.33 | -78.35 | 3.5 | 1.5 | BK7-SF5 | ESA-030 |
| 9.0 | 75.00 | 46.44 | -33.77 | -95.94 | 3.0 | 1.6 | BK7-SF5 | ESA-031 |
| 12.0 | 20.00 | 12.66 | -10.76 | -41.06 | 3.8 | 1.8 | BAF52-LAFN21 | ESA-032 |
| 12.5 | 14.00 | 10.60 | -7.72 | -56.54 | 6.2 | 1.5 | BaF10-FD5 | ESA-033 |
| 12.5 | 20.00 | 13.98 | -9.35 | -76.14 | 5.3 | 1.1 | BaF11-SF10 | ESA-034 |
| 12.5 | 25.00 | 17.27 | -10.99 | -107.03 | 5.0 | 1.3 | BaF10-SF10 | ESA-035 |
| 12.5 | 30.00 | 15.97 | -15.00 | -528.23 | 4.5 | 1.2 | SSKN8-FD10 | ESA-036 |
| 12.5 | 35.00 | 22.94 | -15.54 | -58.84 | 3.7 | 1.5 | SK11-SF5 | ESA-037 |
| 12.5 | 40.00 | 24.77 | -18.01 | -51.17 | 3.7 | 1.3 | BK7-SF5 | ESA-038 |
| 12.5 | 45.00 | 26.82 | -20.12 | -61.38 | 3.5 | 1.5 | BK7-SF5 | ESA-039 |
| 12.5 | 50.00 | 30.73 | -22.32 | -64.75 | 3.5 | 1.5 | BK7-SF5 | ESA-040 |
| 12.5 | 60.00 | 36.51 | -26.33 | -78.35 | 3.5 | 1.5 | BK7-SF5 | ESA-041 |
| 12.5 | 75.00 | 46.44 | -33.77 | -95.94 | 3.0 | 1.6 | BK7-SF5 | ESA-042 |
| 12.5 | 80.00 | 49.62 | -35.73 | -103.22 | 2.1 | 1.6 | BK7-SF5 | ESA-043 |
| 12.5 | 90.00 | 55.80 | -40.17 | -116.32 | 2.0 | 1.6 | BK7-SF5 | ESA-044 |
| 12.5 | 100.00 | 61.54 | -44.39 | -130.26 | 3.0 | 1.5 | BK7-SF5 | ESA-045 |
| 12.7 | 40.00 | 21.28 | -17.00 | -89.95 | 3.0 | 0.8 | BK7-F2 | ESA-046 |
| 12.7 | 50.00 | 26.49 | -21.28 | -114.29 | 2.5 | 1.0 | BK7-F2 | ESA-047 |
| 12.7 | 60.00 | 36.31 | -26.36 | -77.40 | 3.5 | 1.5 | BK7-SF5 | ESA-048 |
| 12.7 | 75.00 | 39.99 | -31.99 | -167.90 | 2.4 | 1.0 | BK7-F2 | ESA-049 |
| 13.0 | 40.50 | 26.04 | -18.02 | -72.03 | 3.3 | 1.3 | SK11-SF5 | ESA-050 |
| 15.0 | 25.00 | 17.97 | -11.20 | -85.31 | 6.3 | 1.8 | BaF11-SF10 | ESA-051 |
| 15.0 | 30.00 | 20.72 | -13.17 | -128.44 | 6.0 | 1.5 | BaF10-SF10 | ESA-052 |
| 15.0 | 40.00 | 26.97 | -17.64 | -205.03 | 6.0 | 1.6 | BaF10-SF10 | ESA-053 |
| 15.0 | 50.00 | 26.81 | -23.82 | -90.79 | 5.0 | 1.5 | BK7-SF5 | ESA-054 |
| 15.0 | 75.00 | 39.61 | -36.46 | -145.02 | 5.0 | 2.5 | BK7-SF5 | ESA-055 |
| 18.0 | 27.00 | 18.70 | -13.11 | -119.12 | 7.7 | 1.6 | BaF10-FD10 | ESA-056 |
| 18.0 | 30.00 | 20.73 | -14.31 | -133.58 | 6.9 | 2.0 | BaFN10-SF10 | ESA-057 |
| 18.0 | 35.00 | 24.26 | -16.23 | -152.99 | 6.0 | 1.6 | BaF10-FD10 | ESA-058 |
| 18.0 | 40.00 | 26.97 | -17.64 | -205.03 | 6.0 | 1.6 | BaFN10-SF10 | ESA-059 |
| 18.0 | 50.00 | 32.36 | -22.49 | -89.13 | 4.5 | 1.5 | SK11-SF5 | ESA-060 |
| 18.0 | 60.00 | 42.51 | -26.24 | -226.77 | 3.9 | 2.0 | BaFN10-SF10 | ESA-061 |
| 18.0 | 75.00 | 53.03 | -32.72 | -288.05 | 3.3 | 2.0 | BaFN10-SF10 | ESA-062 |
| 18.0 | 80.00 | 49.67 | -34.73 | -100.11 | 5.0 | 2.5 | BK7-SF5 | ESA-063 |
| 18.0 | 125.00 | 76.92 | -55.48 | -162.59 | 4.5 | 2.0 | BK7-SF5 | ESA-064 |
| 20.0 | 30.00 | 21.41 | -13.75 | -105.58 | 8.4 | 1.8 | BaF11-SF10 | ESA-065 |
| 20.0 | 35.00 | 24.24 | -15.96 | -139.78 | 7.3 | 1.8 | BaF11-SF10 | ESA-066 |
| 20.0 | 40.00 | 27.63 | -17.58 | -171.25 | 8.0 | 2.0 | BaFN10-SF10 | ESA-067 |
| 20.0 | 60.00 | 35.92 | -28.12 | -83.79 | 5.0 | 2.0 | BK7-SF5 | ESA-068 |
| 25.0 | 30.00 | 21.17 | -16.08 | -118.66 | 11.0 | 3.0 | BaF10-FD10 | ESA-069 |
| 25.0 | 35.00 | 24.47 | -16.49 | -131.65 | 11.0 | 2.5 | BaF11-SF10 | ESA-070 |
| 25.0 | 40.00 | 27.97 | -18.85 | -152.94 | 9.5 | 2.5 | BaF11-SF10 | ESA-071 |
| 25.0 | 45.00 | 28.75 | -21.38 | -82.92 | 7.9 | 3.0 | SK11-SF5 | ESA-072 |
| 25.0 | 50.00 | 34.53 | -21.98 | -214.63 | 9.0 | 2.5 | BaF10-SF10 | ESA-073 |
| 25.0 | 60.00 | 31.94 | -29.95 | -1029.79 | 9.0 | 2.4 | SSKN8-SF10 | ESA-074 |
| 25.0 | 75.00 | 46.44 | -33.77 | -95.94 | 7.0 | 2.5 | BK7-SF5 | ESA-075 |
| 25.0 | 85.00 | 55.68 | -38.37 | -146.45 | 5.0 | 3.0 | SK11-SF5 | ESA-076 |
| 25.0 | 100.00 | 61.47 | -44.64 | -129.94 | 6.0 | 2.5 | BK7-SF5 | ESA-077 |
| 25.0 | 125.00 | 76.28 | -54.55 | -162.43 | 6.0 | 2.4 | BK7-SF5 | ESA-078 |
| 25.0 | 150.00 | 91.37 | -66.21 | -197.71 | 5.7 | 2.2 | BK7-SF5 | ESA-079 |
| 25.0 | 175.00 | 109.16 | -79.38 | -226.03 | 6.0 | 3.0 | BK7-SF5 | ESA-080 |
| 25.0 | 200.00 | 124.12 | -87.26 | -253.10 | 8.5 | 4.0 | BK7-SF5 | ESA-081 |
| 25.0 | 225.00 | 139.53 | -100.21 | -291.32 | 3.0 | 2.5 | BK7-SF5 | ESA-082 |
| 25.0 | 250.00 | 160.73 | -105.64 | -295.75 | 5.0 | 2.5 | BK7-SF5 | ESA-083 |
| 25.0 | 275.00 | 171.03 | -121.54 | -352.46 | 5.0 | 2.5 | BK7-SF5 | ESA-084 |
| 25.0 | 300.00 | 184.84 | -134.06 | -393.98 | 3.0 | 2.5 | BK7-SF5 | ESA-085 |
| 25.0 | 400.00 | 244.65 | -179.62 | -534.10 | 3.0 | 2.5 | BK7-SF5 | ESA-086 |
| 25.0 | 500.00 | 290.71 | -232.07 | -750.52 | 3.0 | 2.5 | BK7-SF5 | ESA-087 |
| 25.4 | 60.00 | 37.67 | -28.58 | -72.78 | 10.0 | 2.8 | BK6-SF10 | ESA-088 |
| 25.4 | 80.00 | 42.46 | -33.88 | -183.65 | 5.8 | 2.6 | BK7-F2 | ESA-089 |
| 25.4 | 100.00 | 52.79 | -42.46 | -228.60 | 4.5 | 2.0 | BK7-F2 | ESA-090 |
| 25.4 | 150.00 | 79.80 | -64.27 | -340.40 | 4.8 | 2.0 | BK7-F2 | ESA-091 |
| 25.4 | 200.00 | 107.15 | -86.70 | -448.70 | 5.5 | 2.3 | BK7-F2 | ESA-092 |
| 25.4 | 250.00 | 133.97 | -108.64 | -562.30 | 5.7 | 2.4 | BK7-F2 | ESA-093 |
| 25.4 | 300.00 | 164.40 | -133.30 | -642.70 | 4.8 | 2.0 | BK7-F2 | ESA-094 |
| 26.5 | 100.00 | 64.04 | -44.88 | -128.72 | 4.8 | 2.0 | SK11-SF8 | ESA-095 |
| 30.0 | 50.00 | 34.81 | -22.12 | -203.48 | 11.0 | 2.2 | BaFN10-SF10 | ESA-096 |
| 30.0 | 60.00 | 32.60 | -31.81 | -799.64 | 8.5 | 3.0 | SSKN8-SF10 | ESA-097 |
| 30.0 | 75.00 | 40.51 | -38.68 | -922.04 | 8.4 | 3.0 | SSKN8-SF10 | ESA-098 |
| 30.0 | 100.00 | 61.36 | -44.30 | -128.90 | 8.3 | 2.8 | BK7-SF5 | ESA-099 |
| 30.0 | 125.00 | 81.53 | -56.59 | -220.08 | 4.9 | 2.5 | SK11-SF5 | ESA-100 |
| 30.0 | 140.00 | 93.22 | -59.14 | -156.67 | 6.5 | 2.5 | BK7-SF5 | ESA-101 |
| 30.0 | 150.00 | 91.31 | -65.57 | -195.87 | 8.1 | 2.6 | BK7-SF5 | ESA-102 |
| 30.0 | 200.00 | 123.77 | -89.22 | -259.43 | 5.0 | 2.5 | BK7-SF5 | ESA-103 |
| 30.0 | 300.00 | 184.40 | -133.95 | -394.96 | 4.5 | 2.5 | BK7-SF5 | ESA-104 |
| 40.0 | 60.00 | 37.33 | -31.54 | -124.51 | 14.5 | 3.0 | SK11-SF5 | ESA-105 |
| 40.0 | 80.00 | 53.76 | -36.73 | -435.85 | 12.1 | 4.0 | BaFN10-SF10 | ESA-106 |
| 40.0 | 120.00 | 65.22 | -62.03 | -1240.67 | 9.6 | 4.2 | SSKN8-SF10 | ESA-107 |
| 40.0 | 160.00 | 98.66 | -70.73 | -205.72 | 8.5 | 4.0 | BK7-SF5 | ESA-108 |
| 40.0 | 200.00 | 124.12 | -87.26 | -253.10 | 8.5 | 4.0 | BK7-SF5 | ESA-109 |
| 40.0 | 250.00 | 156.00 | -108.70 | -313.64 | 8.0 | 4.5 | BK7-SF5 | ESA-110 |
| 40.0 | 300.00 | 194.96 | -148.27 | -483.71 | 9.0 | 4.1 | BaK4-SF10 | ESA-111 |
| 40.0 | 400.00 | 257.16 | -169.03 | -473.08 | 8.5 | 4.0 | BK7-SF5 | ESA-112 |
| 40.0 | 450.00 | 279.60 | -199.51 | -579.39 | 6.0 | 4.0 | BK7-SF5 | ESA-113 |
| 40.0 | 500.00 | 305.31 | -224.08 | -667.68 | 6.0 | 4.0 | BK7-SF5 | ESA-114 |
| 50.0 | 100.00 | 69.28 | -46.95 | -446.01 | 13.9 | 4.0 | BaFN10-SF10 | ESA-115 |
| 50.0 | 150.00 | 96.85 | -73.74 | -241.63 | 9.5 | 4.0 | BaK4-SF10 | ESA-116 |
| 50.0 | 200.00 | 130.48 | -99.36 | -320.20 | 9.0 | 3.5 | BaK4-SF10 | ESA-117 |
| 50.0 | 250.00 | 162.59 | -123.82 | -402.58 | 9.8 | 3.5 | BaK4-SF10 | ESA-118 |
| 50.0 | 300.00 | 173.11 | -164.03 | -709.83 | 9.0 | 3.5 | BaK4-SF10 | ESA-119 |
| 50.0 | 350.00 | 227.16 | -174.83 | -571.49 | 8.0 | 4.0 | BaK4-SF10 | ESA-120 |
| 50.0 | 500.00 | 305.74 | -223.20 | -663.82 | 8.0 | 4.0 | BK7-SF5 | ESA-121 |
| 75.0 | 200.00 | 118.81 | -96.37 | -288.97 | 17.9 | 6.0 | BK7-SF5 | ESA-122 |
| 75.0 | 300.00 | 184.05 | -137.34 | -399.33 | 13.5 | 6.0 | BK7-SF5 | ESA-123 |
| 75.0 | 400.00 | 246.50 | -180.92 | -526.70 | 11.1 | 6.0 | BK7-SF5 | ESA-124 |
