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Hydrophobic and Oleophobic Coatings

Technical Team

Applications in Imaging Optics Oleophobic refers to the physical property of a molecule that repels oil. Fluorocarbons are deposited to the substrate to create a monolayer that repels oil and water. The additional benefit of evaporative oleophobic treatments is also hydrophobicity or inherent water shedding capabilities. This inherent benefit is true of all evaporative oleophobic treatments, but not necessarily inherent in all hydrophobic treatments. The key differentiator between oleophobic and hydrophobic treatments is measured through…

Sunex Part Number Tutorial

Technical Team

Sunex has many online tools designed to help you find a lens according to your specifications that is best suited to your application. Once a lens is identified based on first order parameters, there can be many options or variants of that part number (PN). It is therefore useful to know how to interpret Sunex part numbers and the PN itself can provide insight into the lens’ performance or intended use.  The intention of this…

Cleaning Procedure for Optics

Technical Team

The general guideline for cleaning optics is “if it’s not dirty, don’t clean it”. Handling optics increases their chances of getting dirty or damaged, so you should clean optics only when necessary. Both the proper cleaning products and proper methods are equally important to cleaning the optic. There are different methods for cleaning and certain specialized optics require particular attention and change in procedures. Below are general guidelines to be used as a reference only…

The Advantages and Disadvantages of Stopping Down a Lens

Technical Team

One modification that is commonly requested by our Customers is changing the F/# of a standard lens.  The most common reason to stop down a lens is to resolve more detail and gain greater depth of field in an image. However, the term itself can sometimes be confusing, and there are limits to how much you can stop down a lens before encountering diminishing returns. “Stopping down a lens” refers to increasing the numerical f-stop…

When Does a Hyperspectral, or “Day-Night” Lens Make Sense?

Technical Team

Certain applications require a broad spectral operating range and customers oftentimes inquire whether a lens can perform “well” out to their wavelength of interest. These requests typically involve both visible (VIS) and near infrared (NIR) wavelengths.  For purposes of this discussion, a wavelength range roughly from 470nm (or lower) out to about 850-950nm is assumed. Fundamentally, it is important to consider the use-case of the lens and determine how the VIS and NIR wavelengths apply…

Why is lens design so hard?

Technical Team

With the advent of computers and more processing power, the art of lens design has matured. But computers cannot solve the whole problem. A computer can select a configuration and designer optimizes that configuration. Can a machine learning algorithm find the absolute best lens design? Yes, if you try an infinite number of different design form. But..”I still want to be young when we get there!” Hence, the journey of developing an elegant design will…

FOV Cone for Housing Design- Why the “Edge Ray Entrance Pupil” is Important

Technical Team, , , ,

Many customers use Sunex lenses in a custom housing unit which is unique to their particular application. In many wide-angle lenses, especially fisheye lenses, it is important to understand where the rays of the maximum field of view for a specific sensor are located with respect to a reference datum on the lens in order to design a housing or hood that will maximize the field and not clip the rays. Understanding the concept of…

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