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Lens starburst at fully open aperture

Started Feb 17, 2022 | Discussions thread
Sittatunga Veteran Member • Posts: 5,413
Re: Lens starburst at fully open aperture
1

Atis photo wrote:

Hi,

what could be the reason for starburst effect at fully open aperture 0.5'' @ f4 (RF L24-105) ?

Is it the angle of the light bulb? Or my RF lens is somehow damaged?

I don't have that RF zoom, but other constant aperture zooms I do have achieve their constant aperture by stopping down the iris towards the wider end of the zoom. The nine bladed iris of your zoom would be consistent with the eighteen pointed starburst here.

See the Sunstar section of Ken Rockwell's review here (it's a long way down the review) https://www.kenrockwell.com/canon/eos-r/lenses/24-105mm.htm

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