49-366 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=250mm VIS-NIR 400-1000nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25 mm
- EFL
- 250 mm
- R1
- 160.73 mm
- R2
- -105.64 mm
Material 1
- Name
- N-BK7
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.5185223876207927
- λ
- 550 nm
- B1
- 1.03961212
- C1
- 0.00600069867 μm2
- B2
- 0.231792344
- C2
- 0.0200179144 μm2
- B3
- 1.01046945
- C3
- 103.560653 μm2
Material 2
- Name
- N-SF5
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.6771143911586193
- λ
- 550 nm
- B1
- 1.52481889
- C1
- 0.011254756 μm2
- B2
- 0.187085527
- C2
- 0.0588995392 μm2
- B3
- 1.42729015
- C3
- 129.141675 μm2
49-366 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=250mm VIS-NIR 400-1000nm
The 49-366 is a high-quality achromatic doublet lens, boasting a 25 mm diameter and a focal length of 250mm, specifically designed for the visual and near-infrared spectrum (VIS-NIR) range of 400-1000nm. This lens is sourced from the renowned optical vendor, Edmund Optics, and is available for purchase on their official website.
The lens is constructed from two types of Schott glass, N-BK7 and N-SF5, which are renowned for their excellent optical properties. The N-BK7 glass is used for the first element, while the second element is made of N-SF5 glass. This combination helps to correct chromatic aberration, ensuring sharp and clear images across the entire spectral range.
The lens geometry is meticulously designed, with an inner radius of 0mm and an outer radius of 0mm. The edge thickness is 6.75mm, while the center thickness is 5mm. The lens also features a center thickness 'a' of 2.5mm, providing additional design flexibility.
The lens is coated with Edmund Optics' proprietary VIS-NIR coating (edm visnir0sp2002000) on both the front and back surfaces. This coating enhances the lens's performance in the VIS-NIR range, reducing surface reflections and improving transmission.
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