89-204 50mm Dia. x 250mm FL; VIS-EXT Coated; Double-Convex Lens VIS-EXT 350-700nm
- Type
- Lens
- Subtype
- Spherical Lens (Convex-Convex)
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 50 mm
- EFL
- 250 mm
- BFL
- 248.37 mm
- R1
- 257.57 mm
- R2
- -257.57 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
89-204 50mm Dia. x 250mm FL; VIS-EXT Coated; Double-Convex Lens VIS-EXT 350-700nm
The 89-204 is a double-convex lens, characterized by its spherical shape and circular base. This lens, sourced from Edmund Optics, boasts a diameter of 50mm and a focal length of 250mm, making it a versatile choice for various optical applications. The lens is fabricated from n-BK7 Schott, a high-quality optical glass known for its excellent transparency and homogeneity.
The lens features a double-convex geometry, with radii of curvature of 257.57mm and -257.57mm for the first and second surfaces, respectively. This geometry results in a back focal length of 248.37mm and an effective focal length of 250mm. The lens has a central thickness of 4.93mm and an edge thickness of 2.5mm, providing robustness and durability.
The 89-204 lens is coated with EDM VIS-EXT on both the front and back surfaces. This coating enhances its transmission capabilities within the visible spectrum, specifically between 350nm and 700nm. The coating ensures high-quality image reproduction by minimizing surface reflections and improving light transmission.