# No PSF candidates survive

**URL:** <https://www.rubin.community/t/no-psf-candidates-survive/4400>\
**Category:** Support\
**Tags:** dm-dev\
**Created:** [September 17, 2020, 2:07pm UTC](https://www.rubin.community/t/no-psf-candidates-survive/4400 "2020-09-17T14:07:19Z")\
**Posts on this page:** 1\
**Showing post:** 13

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**Author:** ![MelissaGraham](https://sea2.discourse-cdn.com/flex002/user_avatar/www.rubin.community/melissagraham/32/2549_2.png) [@MelissaGraham](https://www.rubin.community/u/MelissaGraham)\
**Post date:** [October 21, 2020, 8:46pm UTC](https://www.rubin.community/t/no-psf-candidates-survive/4400/13 "2020-10-21T20:46:44Z")

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Hi @raphaelshirley, I am just following up on unsolved topics in Support. It looks like, in this case, some of the suggestions unearthed some underlying issues that have been pursued in other topics: " [The obs\_decam nullIsr task](http://www.rubin.community/t/the-obs-decam-nullisr-task/4462)" and " [Negative peaks in calexp files](http://www.rubin.community/t/negative-peaks-in-calexp-files/4479)". I was wondering if (for posterity) there are any final comments or takeaways for anyone else who might have similar issues in finding and using PSF stars in low SNR images?

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_[View the full topic](https://www.rubin.community/t/no-psf-candidates-survive/4400)._