47-635 25 mm Dia. S-BAH11/N-SF10 Achromatic Doublet; EFL=40mm VIS 0° 425-675nm
- Type
- Lens
- Subtype
- Multiplets
- Brand
- Edmund Optics
Properties
- Shape
- Circular
- Diameter
- 25 mm
- EFL
- 40 mm
- R1
- 27.97 mm
- R2
- -18.85 mm
Material 1
- Name
- S-BAH11
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.6696557498333158
- λ
- 550 nm
- B1
- 1.5713886
- C1
- 0.00910807936 μm2
- B2
- 0.147869313
- C2
- 0.0402401684 μm2
- B3
- 1.28092846
- C3
- 130.399367 μm2
Material 2
- Name
- N-SF10
- Dispersion Equation
- Sellmeier
- n (λ)
- 1.7336618876174243
- λ
- 550 nm
- B1
- 1.62153902
- C1
- 0.0122241457 μm2
- B2
- 0.256287842
- C2
- 0.0595736775 μm2
- B3
- 1.64447552
- C3
- 147.468793 μm2
47-635 25 mm Dia. S-BAH11/N-SF10 Achromatic Doublet; EFL=40mm VIS 0° 425-675nm
The 47-635 is a high-quality achromatic doublet lens, sourced from Edmund Optics, featuring a 25 mm diameter and an effective focal length (EFL) of 40 mm. This lens is specifically designed for the visible spectrum, covering wavelengths from 425 to 675 nm.
The lens is constructed from two types of glass: S-BAH11 from Ohara and N-SF10 from Schott. These materials are carefully selected to minimize chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points. By combining these materials, the 47-635 provides sharp, clear images with minimal color fringing.
The lens geometry is also optimized for performance. It has a center thickness of 9.5 mm and an edge thickness of 8.54 mm. The radii of curvature for the three surfaces are r1 = 27.97 mm, r2 = -18.85 mm, and r3 = -152.94 mm. These parameters are carefully chosen to provide the best possible image quality.
The 47-635 is coated with the EDM VIS-0 standard curve coating on both the front and back surfaces. This coating enhances the lens's transmission in the visible spectrum and provides protection against environmental hazards, such as dust and moisture.
