Hacker News new | past | comments | ask | show | jobs | submit login

It is not just at the focal point but

multilayered lenses can be destroyed as the expand and contract and heat is emminated from the join and also

Any lense with coatings to correct for chromatic abberation, the coatings get destroyed on the surface of the lenses just by being pointed at the sun.




Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact

Search: