More – Understanding Resolution

 

One of myUnderstanding Seriesarticles is titledUnderstanding Resolution. This has proven to be very popular among visitors to this site, as it attempts to address some of the misinformation and BSon this topicthat’s found on the Net.

When I first wrote and published it in early 2001 I was not aware thatRon Harrishad also written on this topic‚ but ten years prior. These two articles were first published inDarkroom and Creative Camera Techniquesmagazine, MAR/APR and MAY/JUN, 1991. The first article was republished inMastering Black-And-White Photography, Vol. 2., and also by Kodak (ProPassport Technical Bulletin 1991, Issue #3).

I am pleased to be able to republish them onThe Luminous Landscape, as they provide a much greater depth of insight on this oft confusing topic.

Please note that these arePDFfiles and that you will need to haveAdobe Acrobatinstalled on your computer to be able to read them. Also, depending on the speed of your Internet connection they may take some time to download.

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Michael

By: Ron Harris

Part 1: Lens Film & Paper

Part 2: Using Modulation Transfer Function

Addendum

Just prior to this re-publication of his 1991 articles I received the following in an e-mail from Ron, reproduced here with his kind permission:

"I applied the same reasoning in my articles to the D30 and the D60, using the imager size and pixel resolution. This gives you 47.6 lines per mm on the imager for the D30 and 67.7 lpm for the D60.

A good 35mm lens can put 67 lpm on film for 20:1 contrast targets. If you enlarge to 4 lpm, the threshold of maximum resolution for the unaided eye, this gives you a maximum print size of 7 x 10.6 inches for the D30 and 10.0 x 15.1 for the D60. I am assuming that it takes two pixels to make a line. The maximum print sizes are smaller than those for 35mm film, because the film size is larger, requiring less magnification.

What really makes the D30 and D60 fly is the low noise compared with film grain. I normally make B&W prints approximately 5 x 7.5 inches using the D30 and they are very fine….a match for scanned Hasselblad negatives."

Ron Harris


Ron Harris (Canon D30)