There's a point midway along the bolt where the threads look deepest and straightest.

Yes. That really stands out with the short focal length lens of a phone camera doesn't it. It's not so obvious with the professional shots.

In reply to Re^4: [OT] Mathematical photographers that program (Perl)? (Updated.) by BrowserUk
in thread [OT] Mathematical photographers that program (Perl)? (Updated.) by BrowserUk

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