Timeline for Why does shorter focal length result in greater beam divergence?
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| Aug 8, 2018 at 20:43 | comment | added | V.F. | @eyeballpaul In order to get parallel rays (no divergence), you would need an ideal point source. Since an LED has a finite size, some divergence is inevitable and, for a given LED, it will increase as the solid angle increases (or the distance from LED to a lens decreases). A smaller LED should also reduce the divergence. You can ask a separate question regarding your best options, but you'll probably need to give more details about your application and requirements. | |
| Aug 8, 2018 at 20:06 | comment | added | eyeballpaul | Thanks for your explanation, I still need to get better understanding of etendue though=) So does this mean aspheric lens could fix this? | |
| Aug 8, 2018 at 1:25 | history | answered | V.F. | CC BY-SA 4.0 |