undefined | Better HN

0 points4ad8y ago0 comments

Focal length has nothing to do with it, in fact, longer focal lengths are generally safer because lenses are slower. Aperture is what matters, lenses gather much more light than our bare eyes.

0 comments

rocqua8y ago

Is the issue aperture or aperture over focal length? The actual aperture (squared) determines how much solar energy you are gathering. The aperture over focal length (again squared) determines the energy per surface unit.

I'm not sure which is more damaging here.

j / k navigate · click thread line to collapse

0 points4ad8y ago0 comments

Focal length has nothing to do with it, in fact, longer focal lengths are generally safer because lenses are slower. Aperture is what matters, lenses gather much more light than our bare eyes.

0 comments

rocqua8y ago

I'm not sure which is more damaging here.

j / k navigate · click thread line to collapse