User talk:86.145.59.117

I reverted some of your changes to f-number. In particular, the article distinguishes between $$f$$ as a variable representing focal length, and the hooked f in the compound symbol, which is not a variable. I also reverted removal of the standard math font for other variables. When variables are used in math-formatted equations, it's better for them to appear in the same font when they appear in the body of the article.--Srleffler (talk) 16:56, 7 April 2019 (UTC)