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Re:Ask HN: Post Explaining Cameras and Apertures by encypruon on Saturday March 06, 2021 @03:54PM (#26370448)
Have you tried the search at the bottom of this site? (Just in case you missed it)

Anyway, I think this might be the submission you're looking for:

https://news.ycombinator.com/item?id=25357315

At least it's the one that came to my mind when I read your description. Being able to vividly remember posts from 86 days ago makes me feel a bit anxious about how much time I spend on HN and how much of my brain is allocated for storing what I read here.

Re:Ask HN: Post Explaining Cameras and Apertures by guuggye on Saturday March 06, 2021 @10:21PM (#26372831)
That is it! Thanks so much.

I had tried searching first but this didn’t turn up in the search results.