| Sources for 4f tube lenses that aren’t Thorlabs? | 3 | GCDubbs | | | | |
| Zemax License/FoB | 3 | Ashamed_Fee_7417 | | | | |
| Large diameter beam expander help! | 2 | Werewolf_dad | | | | |
| Why can't I see clearly through glasses for highly nearsighted people? | 2 | MicroneedlingAlone2 | | | | |
| Need help, I'm Trying to Make a Binocular/Spotting Scope Testing Display. | 2 | TravelingBagsMKE | | | | |
| How much does lens tilt and decentre affect beam width at focus? | 2 | shatners_basoon | | | | |
| Macro video of pens | 1 | Indifference_Endjinn | | | | |
| Inside of a rifle scope, is this crack/gouge going to cause an issue? | 1 | lookatmygrow | | | | |
| noob needs help | 1 | functionalfilms | | | | |
| Can lens array design for use with various sensors be learnt online somewhere, looking for a friend. | 1 | squeaki | | | | |
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