1. T-stop - Noun
2. T-stop - Verb
(photography) A transmission stop; an alternative to an f-stop.
(skating) A method of stopping by placing one foot perpendicular to, and behind, the other, thereby forming a T shape.
T-stop (third-person singular simple present T-stops, present participle T-stopping, simple past and past participle T-stopped)
(intransitive, skating) To perform a T-stop.
If you’re using lenses set to the same t-stop, it will, whereas if you’re using lenses set to the same f-stop, it might not. Source: Internet
This doesn’t mean you can’t use photography lenses to make videos, it just means you need to do a little bit of research and math to figure out the t-stop. Source: Internet