49-551 25mm Dia. x -50mm FL; NIR I Coated; Double-Concave Lens 600-1050nm
- Type
- Lens
- Subtype
- Spherical Lens (Concave-Concave)
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25 mm
- EFL
- -50 mm
- BFL
- -50.82 mm
- R1
- -52.1 mm
- R2
- 52.1 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
49-551 25mm Dia. x -50mm FL; NIR I Coated; Double-Concave Lens 600-1050nm
The 49-551 is a double-concave lens with a diameter of 25mm and a focal length of -50mm, making it a negatively powered lens. This lens is sourced from Edmund Optics, a reputable vendor known for its high-quality optical elements. The lens is designed for use within the near-infrared (NIR) spectrum, specifically between 600 and 1050nm, making it suitable for a variety of NIR applications.
The lens is made from N-BK7 Schott glass, a common material in optical systems due to its excellent optical properties and high Abbe number. The lens features a standard anti-reflection coating, specifically the EDM NIR-I coating, on both the front and back surfaces. This coating is designed to minimize surface reflections and increase transmission within the NIR spectrum, further enhancing the lens's performance in its intended application range.
The lens's geometry includes an edge thickness of 5.4mm and a center thickness of 2.5mm. The front and back radii of curvature are -52.1mm and 52.1mm, respectively, contributing to the lens's double-concave shape. The back focal length (BFL) is -50.82mm, slightly shorter than the nominal focal length due to the thickness of the lens.