LE1985-A 50.8 mm Dia. N-BK7 Positive Meniscus Lens; EFL=300mm 350-700nm
- Type
- Lens
- Subtype
- Spherical Lens (Convex-Concave)
- Brand
- Thorlabs
Properties
- Shape
- Circular
- Diameter
- 50.8 mm
- EFL
- 300 mm
- BFL
- 293.8 mm
- R1
- 100.1 mm
- R2
- 279.1 mm
Material
- Name
- N-BK7
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.5167984379050088
- λ
- 587.6 nm
- B1
- 1.03961212
- C1
- 0.00600069867 μm2
- B2
- 0.231792344
- C2
- 0.0200179144 μm2
- B3
- 1.01046945
- C3
- 103.560653 μm2
LE1985-A 50.8 mm Dia. N-BK7 Positive Meniscus Lens; EFL=300mm 350-700nm
The LE1985-A is a 50.8 mm diameter Spherical Lens with a Positive Meniscus shape, sourced from the reputable vendor Thorlabs. This lens is designed for use in the visible spectrum, specifically optimized for wavelengths between 350nm and 700nm.
The lens is made from N-BK7, a high-quality borosilicate glass known for its excellent optical properties. This material is particularly suitable for applications that require high homogeneity, low auto-fluorescence, and good thermal stability.
The LE1985-A has a focal length (EFL) of 300mm, making it suitable for use in imaging systems, beam shaping, or other applications where a long focal length is required. The lens has a convex-concave geometry, with radii of curvature of 100.1mm and 279.1mm for the front and back surfaces, respectively. This geometry results in a Back Focal Length (BFL) of 293.8mm.
The lens has a center thickness of 5.1mm and an edge thickness of 3mm, providing robustness and durability. The lens is coated with THo A Bbar on both the front and back surfaces, enhancing its transmission and protecting it from environmental hazards.
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