3 ms·
Good summary but I found it a bit weird how only 2 seconds were spent on the 'camera aperture' explanation - as AFAIK that's the main cause for photos of stars
by staindk 5y ago
Good summary but I found it a bit weird how only 2 seconds were spent on the 'camera aperture' explanation - as AFAIK that's the main cause for photos of stars and lights to have 'points' - it depends on how many 'leaves' (? term) your camera/lens aperture has -> the more leaves the "more-sided" a shape the aperture makes (hexagon, octagon...) thus the more points you get when photographing lights.
- Green_man 5y agoThe number of rays is determined by the number of aperture blades, as well as whether there's an even or odd number of aperture blades https://phillipreeve.net/blog/best-lenses-for-sunstars/#The_basics https://phillipreeve.net/blog/best-lenses-for-sunstars/#The_... Interestingly, some modern photography lenses have achieved aperture mechanisms with much rounder geometry, sometimes with near perfect circles at multiple apertures. This can result in a more desirable bokeh, at the cost of well defined sun stars.
- blauditore 5y agoThe article fails to explain that, but round aperture is equivalent to infinitely many straight blades (and thus rays), so there is a light halo instead of distinct rays.
- Sharlin 5y agoWhich is essentially also why you get more diffraction limited as you stop down the aperture -- a larger and larger fraction of the light that gets through passes near the edges (and gets diffracted) rather than the central area.
- hatsunearu 5y agoyup, but when you step down the aperture a lot (which is when the sun star effect becomes more pronounced), the aperture transitions from more circular to more polygonal, so with a lot of lenses, the behavior is that when your aperture is a few steps of fully open, it is basically circular but when you need the sun starts it's definitely there.