Lens elements, whether concave or convex, were originally only composed of surfaces that represented part of a perfect sphere. The problem with this is that there are situations where such combinations of ‘spherical’ lenses cannot project an image that is uniformly focused across the flat surface of the camera sensor. Aspherical lenses, where the curve of the lens element surface is no longer part of a perfect sphere, can be used to correct such focusing aberrations and therefore medium to wide aperture lenses now encompass aspheric designs as vital components.
Aspheric lenses are not restricted to 400-700 nanometre (visible) applications. There is now an increasing demand in custom aspheric lenses for use in the infrared spectrum encompassing materials such as germanium which is used in MWIR, 3-5µm, for thermal imaging.
Knight Optical offers an extensive custom manufacturing service supplying cost-effective, bespoke optical solutions. We are able to produce custom aspheric lenses in a plethora of different materials and sizes. Over the last three decades Knight Optical has developed an industry leading reputation, having supplied aspheric components to small scale university laboratories to multinational camera equipment brands. We have several types of aspheric lenses available for custom production. These include the following:
Our typical custom aspheric lenses capabilities:
Diameter 3mm to 200mm+
Focal Length 3mm to 1000mm+
Centration < 3 arc seconds
Surface Figure < 0.1 fringes
Scratch/Dig < 10:5
Coating Options AR Coated for UV/VIS/IR
Material Schott glass (or equivalent)
Stock Aspheric Lenses
ISO 14001: Environmental Management
we strongly believe that all businesses should be mindful of their environmental impact and seek to manage this effectively in their day to day activities. Green energy, recycling, carbon footprints and other environmental issues are very real concerns and we feel it is important to demonstrate to our customers our commitment to minimising our environmental impact.
Knight Optical has adopted and been certified for ISO 14001: Environmental Management System to comply with our environmental obligations. Our EMS framework allows us to have a systematic approach to the way we handle the challenges brought on by our commitment to environmental standards.
ISO 9001: Quality Management Systems
quality should be consistent and customers should expect the same high quality service and products every time they order from us. In being certified for ISO9001, we are able to constantly monitor the way we work and ensure a consistently high level of service. We have well defined and documented procedures to ensure consistency and allow for corrective measures to be quickly applied should faults be found.
Our ISO9001 procedures give our management a clear and concise picture of how the company is performing. This mechanism of reviewing goals and performance aids us in our efforts to push forwards and improve as our company grows.
At Knight Optical we pride ourselves on the quality of our products and service. Every component is individually tested by our highly skilled technicians in our state-of-the-art metrology lab to ensure all parts meet our high quality standards. Our metrology laboratory is well equipped with the latest optical measurement technology including our ZYGO Verifire interferometer for form and Trioptics OptiSpheric for focal length and radius testing. All our coatings are thoroughly tested on our Cary 5000 spectrophotometer with new UMA reflectance attachment.