Knowledge Hub

01.03.2024 | Technical paper

Using Different Illumination Sources? Get ready to Change Your Lens Focus

By Stuart W. Singer and Jim Sullivan

The human eye perceives wavelengths between 0.400 μm (blue) and 0.700 μm (red) as white light. Standard lenses are optimized for white light, but issues can arise with non-white light sources in digital camera-based vision systems. Defining lighting requirements early is crucial. A case example using a 75 mm f/3.0 lens is discussed, focusing on selecting wavelengths and achieving desired modulation transfer function (MTF) values.

09.09.2023 | General

Manufacturing dates of our lenses

The following chart is intended to help you establish the age of your Schneider-Kreuznach lens. Simply locate your lens's serial number in the chart below, and you can find out approximately how old it is.

09.09.2023 | General

Modulation Transfer Function (MTF)

The modulation transfer function (MTF) is a parameter for assessing the performance of a lens. Find out how it works.

09.09.2023 | Filters

Characteristics of optical filters

Optical filters make it possible to control the effect of different types of light on the sensor. These filters are defined by their characteristic filter curve, which shows how much light they transmit or absorb. By understanding this curve, photographers can better adjust light sources and sensors to achieve the desired effects.

12.11.2024 | Lenses

Beamsplitter lenses

Provide uniform, shadow-free illumination with integrated coaxial light division.

09.09.2023 | Lenses

Color errors in lenses

Color errors occur because the refractive index of optical glass varies for different wavelengths (colors). This phenomenon is called dispersion. There are two classes of chromatic aberration.

09.09.2023 | Lenses

Infrared-compatible lenses

If the sensitivity of the image sensor is to be used in the near infrared range, lenses must be used that have sufficient transmission and imaging performance in this wavelength range (approx. 700-1000 nm).

09.09.2023 | General

Natural light sources

Find out how natural light affects your shots, how daylight is made up of sunlight and diffuse light and how the color temperature changes depending on the location and conditions. The text describes the characteristics of sunlight, moonlight and artificial light and the challenges of taking pictures under these conditions.

18.04.2024 | General

Basic knowledge optics

We explain the basics of optics and our products to students and interested people with little previous knowledge.