Irradiance and Apertures of Camera Lenses by Dr. Vladan Blahnik. From The Zeiss Blog.


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Here is a grab from the very informative Zeiss Blog. Make sure to download the PDF below.

“Lens aperture is – in addition to film or image sensor sensitivity – responsible for the degree of irradiance striking the image plane. In a detailed technical article ZEISS expert Dr. Vladan Blahnik shows why lens aperture depends upon object distance and explains the underlying mechanisms for several optical designs of ZEISS lenses.

With many concrete illustrations the reader also learns why a lens should be panned around the entrance pupil, why anti-reflection coatings are so important for image quality, how lens focusing with floating elements is realized or why optical designs strongly depend upon the available space as given by the camera layout.”

Download the technical article as PDF: Click here!

Jared Abrams is a cinematographer based in Hollywood, California. After many years as a professional camera assistant he switched over to still photography. About two years ago a new Canon camera changed the way the world sees both motion and still photography. He just happened to be in the right place at the right time.