First off, let me dissuade you from one possible – and erroneous – interpretation of the findings of the last post: “Well, gee, if the sensor can’t resolve all of the detail that my lens can put out at f/8, why don’t I just stop down to f/16, where it will be balanced, and I’ll… [Read More]
What’s your Q?
Another way of looking at the minimum resolvable distance between two points is to turn it on its head and look at spatial frequencies. When we do that, we can restate one of the conclusions of this post as: the upper cutoff spatial frequency of a diffraction–limited lens is one over the Sparrow distance, or… [Read More]
Who are you going to believe, me or your own eyes?
If you’ve ever spent time with a good astronomical telescope and a short-focal-length eyepiece, you know that Airy disks don’t look like the ones I graphed in the preceding post. The rings (bumps in cross-section) around the central haystack are much more prominent. What gives? Am I lying to you? Is my math wrong? Here’s… [Read More]
Camera vs sensor resolution
There’s been a lot of discussion on the web about the relationship of lens and sensor resolution. Questions often go something like, “Is putting lens A on camera B as waste of money, since lens A can resolve X while camera B can only resolve Y?” I looked around and found that there’s a body… [Read More]
Contrast Sensitivity Functions and the Bayer Array
In this post , I looked for drop offs in chromaticity in the octave or two before the highest image frequencies, and failed to find them. Some had hypothesized that such a drop would be a reason for the relative undersampling of chromatic versus achromatic information in the Bayer Color Filter Array (CFA). I did find… [Read More]
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