BK7/SF11 cemented achromatic doublet lenses corrected for chromatic aberration across the visible spectrum. Achieve diffraction-limited performance for imaging, microscopy and machine vision systems where color fidelity is critical.
| Material | N-BK7 (positive element) + SF11 (negative element) |
| Transmission Range | 380 - 2,100 nm (optimized for VIS) |
| Chromatic Correction | Corrected for 2 wavelengths (typically 486nm & 656nm) |
| Diameter Range | 5mm - 100mm |
| Focal Length Range | 10mm - 1,000mm |
| Surface Quality | 20-10 / 40-20 (MIL-PRF-13830B) |
| Centration | < 3 arc min (standard) / < 1 arc min (precision) |
| Wavefront Error | < lambda/4 @ 632.8nm |
| Coating | BBAR VIS / Custom |
Parameter Reference Guide
Typical Standard capability — available as shown
Available Alternative options exist — request quotation
Custom Per your drawing — quote after review
Subject to Review Depends on project specifics
Select the optimal optical material based on your wavelength, power, thermal environment and mechanical requirements.
Coatings are engineered around your specific wavelength and operating conditions.
We optimize specifications to match your system requirements — not over-specify. Tighter tolerances increase cost without always improving system performance. Typical manufacturing capabilities:
Every component undergoes 100% inspection before shipment with full documentation including interferometer reports, spectral curves, surface quality images and dimensional data.
Chromatic correction limits: Standard achromats correct for two wavelengths (typically 486nm and 656nm). Residual color error (secondary spectrum) is typically 1-2% of the focal length. For tighter color correction, consider apochromatic triplets or fluorite elements.
Cemented vs air-spaced: Cemented doublets are standard for most applications. Air-spaced doublets offer slightly better correction and higher LIDT for laser applications but cost more and are more sensitive to alignment.
Temperature range: Standard optical cement operates from -40 degrees C to +80 degrees C. For extended temperature ranges, specify high-temperature cement or consider air-spaced designs.
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Specification Parameters
Typical Specifications shown on this page are standard capabilities. Available Options include alternative materials and coatings. Custom Specifications are available per your drawing. Requirements beyond standard capability are marked Subject to Engineering Review.
Upload your drawing or specifications. Our engineering team will review and respond within 1 business day.
When requesting a quote for this product, please specify the following parameters to help our engineering team provide an accurate quotation:
Not sure about specifications? Upload your drawing and our team will assist with engineering review.