S-DLB-15-25PM Lens

[Features]
· A product with surface quality one level below the spherical achromatic lens (DLB).
· It can be used in optical systems where high surface quality is not called for, as with telescope lenses or imaging lenses for microscopes.
· Specifications other than the surface quality are almost the same as DLB.
· With the exception of high-precision experiments using lasers, we recommend this lens.
· Optimized for low deviation of the focal length and minimized aberration over the entire visible light range.
· Corrected not only for aberrations on the on-axis object point but also for off-axis coma aberration and astigmatism.
· * Use achromatic lenses when imaging a picture with infinite distance as the focus or changing the positional light source to parallel light.
· * Sufficient optical performance cannot be obtained when used for imaging at a close distance, etc.
· * Achromatic lenses are oriented for incidence of parallel light.
· * Have parallel light incident from the surface with the smaller radius of curvature (the surface indicated by the arrow).
· * Having parallel light incident from the opposite side causes chromatic and spherical aberration, and enlarges the condensing spot.
[Product Specifications]
· [ Common Specifications]
· Material: BK7, SF2
· Design Wavelength: Blue: 486.1 nm, Green: 546.1 nm, Blue: 656.3 nm
· Eccentricity: < 3'
· Coating: Anti-reflective Film
· Scratch-Dig: 60-40
· Effective Diameter: 90% of External Diameter
· [Individual Specifications]
· Outer diameter φD: φ15 mm
· Focal distance f: 25.2 mm
· Rim thickness te: 6.0 mm
· Central thickness tc: 8.8 mm
· Back focus fb: 20.7 mm