Kelly Lepo - @kellylepo@astrodon.social on Twitter: "The diffraction spikes we see in Hubble images are mostly caused by the struts holding up the secondary mirror. Here we see a model of the
![Comparison between diffraction limited PSF profile (red line) and AO... | Download Scientific Diagram Comparison between diffraction limited PSF profile (red line) and AO... | Download Scientific Diagram](https://www.researchgate.net/publication/230851613/figure/fig6/AS:668998744145924@1536513138992/Comparison-between-diffraction-limited-PSF-profile-red-line-and-AO-corrected-PSF-black.png)
Comparison between diffraction limited PSF profile (red line) and AO... | Download Scientific Diagram
![Diffraction effects of secondary mirror spiders on telescope image quality. | Download Scientific Diagram Diffraction effects of secondary mirror spiders on telescope image quality. | Download Scientific Diagram](https://www.researchgate.net/publication/47718414/figure/fig4/AS:668403207528448@1536371151016/Diffraction-effects-of-secondary-mirror-spiders-on-telescope-image-quality.png)
Diffraction effects of secondary mirror spiders on telescope image quality. | Download Scientific Diagram
![Diffraction-limited PSF for an annular aperture with a narrow opaque... | Download Scientific Diagram Diffraction-limited PSF for an annular aperture with a narrow opaque... | Download Scientific Diagram](https://www.researchgate.net/publication/47718414/figure/fig6/AS:668403207503877@1536371151073/Diffraction-limited-PSF-for-an-annular-aperture-with-a-narrow-opaque-strut-consisting-of.png)
Diffraction-limited PSF for an annular aperture with a narrow opaque... | Download Scientific Diagram
Finding Resolution: How to Use the Point Spread Function in OpticStudio to Assess Diffraction-Limited Imaging Systems
![An on Orbit Determination of Point Spread Functions for the Interface Region Imaging Spectrograph | SpringerLink An on Orbit Determination of Point Spread Functions for the Interface Region Imaging Spectrograph | SpringerLink](https://media.springernature.com/lw685/springer-static/image/art%3A10.1007%2Fs11207-018-1347-9/MediaObjects/11207_2018_1347_Fig4_HTML.png)