Probably the smaller F# the better, but use whatever gives you the best image. You can use any F# too, but you just need to know what it is. Then apply this formula, or use our calculator ) d p w 2 + h 2 P P I d p d i where. Exposure time does not matter just get the best image you can. If you want to calculate pixel density of your screen, you will have to know: horizontal and vertical pixel counts and your diagonal screen size. You will have to know your lens EFL and D or if it is a photography lens use the f# (f-number) setting because F# = EFL/D. Also, you can find some comments on the dot pitch definition and its decline in usage.
In this text, we will teach you what is PPI, and explore the differences between PPI vs DPI through the DPI definition. Count the pixels across the center spot within the 1st Airy minimum and that is the number of pixels for the Q equation. This PPI calculator (pixels per inch calculator) finds the resolution of your display based on its dimensions and the pixel count. Then take an image of this pinhole and you should be able to observe the PSF or Airy rings. You could place a cheap laser diode (purchase online for $20) behind the pinhole and use its wavelength). For white light use 587nm as your center wavelength. Focal Length Enter Pixel, Resolution, Working Distance and FOV Sensor Pixel Size (u) Enter the Sensor Pixel Size Resolution Horizontal (pixels) Enter the. Compute the maximum pixel size for each selected raster in the. You can buy a pinhole fairly cheap at Thorlabs or Edmund Optics or you can make one with tin foil and a needle. Note: For simple calculations please select a value from the drop-down box Enter your own values. and are you in a laboratory setting? If not then you could try a simpler experiment to measure the PSF, which is to just place a bright light behind a very small hole at the farthest distance you can get in your home. Sensor calculations based on sensor resolution and pixel size. Do you know any of the parameters I mentioned like EFL, effective D, etc.