Not my usual aero content but we often rely on cameras in wind tunnel testing. Camera f-number is calculated w a simple formula:
focal length / aperture diameter
As f-number ⬆️, image brightness ⬇️ & depth of field ⬇️
This is a good viz of the effect
focal length / aperture diameter
As f-number ⬆️, image brightness ⬇️ & depth of field ⬇️
This is a good viz of the effect
Here’s a few other nice figures summarizing f-number
How do we get the common “f-stops” seen in the images (f/1, f/1.4, f/2, etc)?
These are powers of sqrt(2) so that light intensity changes by factors of 2 between f-stops (because intensity scales w area which goes as d^2)
How do we get the common “f-stops” seen in the images (f/1, f/1.4, f/2, etc)?
These are powers of sqrt(2) so that light intensity changes by factors of 2 between f-stops (because intensity scales w area which goes as d^2)
Want the best of both worlds, or just have trouble deciding what you want?
Use a plenoptic lens, which relies on a “micro-lens array” to image the entire 4D light field. This enables refocusing, changing f-number, and slight tilt adjustments in post processing!
Use a plenoptic lens, which relies on a “micro-lens array” to image the entire 4D light field. This enables refocusing, changing f-number, and slight tilt adjustments in post processing!
A couple good graphics on plenoptic imaging to at least help you visualize what I mean by micro-lens array
Worth reading about more if you’re interested. Neat technology
en.m.wikipedia.org/wiki/Light_fie…
Worth reading about more if you’re interested. Neat technology
en.m.wikipedia.org/wiki/Light_fie…
Thank you Richard for pointing out my typo
Should read: as f-number ⬆️, brightness ⬇️ & depth of field ⬆️
🤦♂️🤦♂️🤦♂️
Should read: as f-number ⬆️, brightness ⬇️ & depth of field ⬆️
🤦♂️🤦♂️🤦♂️
https://twitter.com/RGatley/status/1470830503733387264
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