65-978 25 mm Dia. N-FK5/F2HT Achromatic Doublet; EFL=75mm UV-VIS 345-700nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25 mm
- EFL
- 75 mm
- R1
- 45.5 mm
- R2
- -36.34 mm
Material 1
- Name
- N-FK5
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.4889720412922705
- λ
- 550 nm
- B1
- 0.844309338
- C1
- 0.00475111955 μm2
- B2
- 0.344147824
- C2
- 0.0149814849 μm2
- B3
- 0.910790213
- C3
- 97.8600293 μm2
Material 2
- Name
- F2HT
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.6236551229276037
- λ
- 550 nm
- B1
- 1.34533359
- C1
- 0.00997743871 μm2
- B2
- 0.209073176
- C2
- 0.0470450767 μm2
- B3
- 0.937357162
- C3
- 111.886764 μm2
65-978 25 mm Dia. N-FK5/F2HT Achromatic Doublet; EFL=75mm UV-VIS 345-700nm
The 65-978 is a high-quality achromatic doublet lens, boasting a 25 mm diameter and an effective focal length of 75mm, specifically designed for UV-VIS applications within the wavelength range of 345-700nm. This lens is sourced from the renowned optical vendor, Edmund Optics, and is available for immediate purchase.
The lens is constructed from two types of Schott glass: N-FK5 and F2HT. The combination of these materials in a doublet configuration effectively minimizes chromatic aberration, ensuring sharp and clear imaging across the specified wavelength range. The lens features a standard UV-VIS coating on both the front and back surfaces, further enhancing its performance and durability.
The geometry of the lens is meticulously designed, with a central thickness of 5.5mm and edge thickness of 5.44mm. The lens curvature is defined by three radii: r1=45.5mm, r2=-36.34mm, and r3=-96.6mm. These parameters contribute to the lens's excellent optical performance.
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