K9 double concave lens
◆ Materials: K9 The essence of annealing
◆ Focal length: ±2%@587.6nm
◆ Diameter Tolerance: +0.0/-0.20
◆ Center Thickness: ±0.1
◆ Center deviation: 3′
◆ Diaphragm: 1~5
◆ Irregularity: 0.2~0.5
◆ Clearing: IV stand
◆ Coating: MgF2 antireflection film
◆ Aperture: ＞90%?
f'=Focal length fb=Back focal length Tc=Thickness of center Te=Thickness of edge
Model | φ | R | f' | fb | Tc | Te | Weight(g) |
KSA-401 | 6.0 | 10.5 | -9.8 | -10.4 | 2.0 | 2.9 | 1 |
KSA-424 | 10.0 | 15.951 | -15.1 | -15.8 | 2.0 | 3.6 | 1 |
KSA-423 | 10.0 | 31.347 | -30.0 | -30.7 | 2.0 | 2.8 | 1 |
KSA-402 | 12.7 | 19.975 | -19.0 | -19.7 | 2.0 | 4.2 | 1 |
KSA-403 | 12.7 | 26.592 | -25.4 | -26 | 2.0 | 3.6 | 1 |
KSA-404 | 12.7 | 39.72 | -38.1 | -38.8 | 2.0 | 3.0 | 1 |
KSA-422 | 20.0 | 31.48 | -30.0 | -30.8 | 2.7 | 6.0 | 3 |
KSA-421 | 20.0 | 41.833 | -40.0 | -40.9 | 2.7 | 5.1 | 3 |
KSA-420 | 20.0 | 62.476 | -60.0 | -61.2 | 2.7 | 4.3 | 3 |
KSA-405 | 25.4 | 53.022 | -50.8 | -51.8 | 3.0 | 6.2 | 6 |
KSA-406 | 25.4 | 78.032 | -75.0 | -76.3 | 3.0 | 5.1 | 6 |
KSA-407 | 25.4 | 103.869 | -100.0 | -101.7 | 3.0 | 4.6 | 6 |
KSA-408 | 25.4 | 156.126 | -150.0 | -150.9 | 3.0 | 4.1 | 6 |
KSA-419 | 30.0 | 62.657 | -60.0 | -61.3 | 3.5 | 7.1 | 7 |
KSA-418 | 30.0 | 186.641 | -180.0 | -181.1 | 3.5 | 4.7 | 7 |
KSA-417 | 30.0 | 258.993 | -250.0 | -251.3 | 3.5 | 4.4 | 7 |
KSA-416 | 40.0 | 104.055 | -100.0 | -101.4 | 4.0 | 7.9 | 19 |
KSA-415 | 40.0 | 155.72 | -150.0 | -151.4 | 4.0 | 6.6 | 18 |
KSA-412 | 50.8 | 259.248 | -250.0 | -251.5 | 5.0 | 7.5 | 29 |
KSA-413 | 50.8 | 414.87 | -400.0 | -401.6 | 5.0 | 6.6 | 29 |
KSA-414 | 50.8 | 517.647 | -500.0 | -501.7 | 5.0 | 6.3 | 29 |