Archives for 2014

I’ve been working on camera and lens simulation for a couple of weeks, and I decided that I needed a technique for calculating the spatial frequency responses (SFRs) and modulation transfer functions (MTFs) of synthetic images that was a) completely open, so I could understand just what it was doing, and b) embeddable in my… [Read More]

There is a trend in the camera marketplace to offer cameras with no antialiasing (AA) filters. None of the medium format camera that I know of use such filters. Recent full frame and APS-C cameras from Leica, Sony and Nikon have also dispensed with AA filters. In the recent posts about Imaging System Q I… [Read More]

With a lens this good, the real question is. “At what f-stops is the lens diffraction-limited.?” I thought I’d try to find out. The motivation is to get some insight into how close real photographic lenses are to being diffraction-limited, and thus learn whether or not the concept of Imaging System Q, which I’ve been… [Read More]

I processed a reduced-contrast version of the ISO 12233 target, with white point of 200 and black point of 55, through the camera simulator of the last post. To review, here are the specs of the simulated camera. Perfect, diffraction-limited lens set at f/8. 550 nm light used to calculate diffraction, even for the red… [Read More]