Lens aperture effects - free 32 page article by Zeiss

[DQE]

[BEGIN EDIT]

A clarification - the text in my original note was copied from an email sent to me by Zeiss as a cover note regarding their new technical article.

Also, Rik let me know by PM that he found an apparent technical error in the cover note with regard to the text "film or sensor sensitivity" in the "degree or irradiance". I agree that sensor sensitivity doesn't affect irradiance. Should one of us (Rik!) contact Dr. Blahnik for clarification?

I haven't read Dr. Blahnik's article in detail, but I believe it may be of interest to the forum, especially considering that it was written by a Zeiss scientist.

(NOTE: I substituted a shorter, more direct link to the technical article, for ease of use.)

Please accept my apology for failing to mention that this is a Zeiss cover note and not my words.

[END EDIT]

<THE FOLLOWING IS THE COVER NOTE FROM A ZEISS EMAIL DISTRIBUTION:>

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About the irradiance and apertures of camera lenses

by Dr. Vladan Blahnik, Carl Zeiss AG

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:

http://www.zeiss.com/content/dam/Photog ... rtures.pdf