T-Stops vs F-Stops: When to pick which | Tokyo

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1. T is transmittence you stupid ! not the reverse of f.If you dont know something do not make it up.
2. Crystal clear!!
3. Thank you for another great video! Great in-depth information about T-stops vs. f-stops! The one by one measuring/calibration of top notch lenses (say: Cooke) explains (in part) why they have such an "astronomical" price tag. Looking forward to many more of your videos. Would love having you as my teacher (I do short film projects as a hobby = spending money I "technically" don't have - on Super 16mm film, it is all about practice, knowing your camera(s), film stocks and lenses - how they behave in the field, no LCD monitor, no histogram, all old school and macgyvering to make things work - and I think the results look gorgeous :-) ). Have a great 2017!
4. They test every lens individually? So if you get two copies of the same lens, the T-markers may be slightly different to compensate for production variance between copies?
5. Wolfcrow- my film teacher!! thanks so much for another great video.
   curious if you would consider doing a video or if you have one that I have missed, on why/when to shoot anamorphic and also aspect ratio ie. differences between 2:35:1 and 16:9 ect... Thanks wolf!
   -Your loyal viewer
6. Man, you are not only so wrong, but also arrogant, ignoring all the comments pointing your misinformation. It's not the first I've seem here...
   It's very sad to see how begginers are being so flooded with uncorrect content. The internet is a wonderful place for study, but so tricky.
   
   The issue here is far from being an opinion. F-Stop is: the ratio between the focal length and the diameter in mm of the apperture. Period.
   Please, study more before putting this kind of content.
   Be responsible.
7. F-stop is not a theoretical value, it is the ratio between physical quantities (it means you can actually measure it), namely the lens focal lens and the diameter of the entrance pupil.
   
   Moreover, depth of field and size of CoC (circle of confusion) as you move away from the plane of focus, is related to f-stop (transmission does not play a role here) and it is one of the reasons why it is more used in photography.
   
   I agree about the T-stop part.
8. Hey, thank you for the informative video. I have a doubt though, I have a Sekonic 758C light meter. If I'm shooting with master primes that have T-stops. My light meter reads f/2.8 for key light and I am exposing for the key light but the meter doesn't show T-stop. So what aperture should I expose at finally?
9. So much misinformation here. I'm sure you're well intentioned but ASC cinematographers completely disagree. For one: f-stop is not theoretical. Pull this video and stop spreading misinformation.
10. Just a notice. The opening part about f/stops is misinformation. F/stop is not a theoretical value, it is a calculation using a mathematical formula (a very simple one). The focal length / the diameter of the opening = f/stop in precise and very much non-theoretical form. A 50mm lens with a 25mm diameter = f/2. The f/stop is not to measure precise light transfer as a T-stop is hence it is not an inaccurate form of measurement, but rather a different unit of a similar concept.
11. Another video of misinformation from Wolfcrow and the people below that don't know any better lap it up and thank you.
    
    If you want to know these things study peer reviewed text, go to film school (not a media college) or seek out professionals in the field, Roger Deakins for example runs his own forum. Please stop making it up as you go along.
    
    f stops are 100% accurate markings, the reason why is simply down to what they are based on, what they tell you and has nothing to do with light, at all.
    
    Firstly....
    Focal length is the distance from the optical centre of the lens to the film plane the bayonet mount is designed for when focused at infinity, that number divided by the diameter of the lens is the maximum aperture size as a ratio. Example, a 2 inch focal length with a 1 inch diameter is expressed as f/2 (2 divided by 1 = 2), the iris can now alter that relationship by reducing the diameter of the lens opening to create new f stop numbers.
    
    T stop is a compensated f stop number that is found after the measurement of light transmittance has been tested through the lens, it is still a f stop number and is expressed in exactly the same way. For example, it's not that T 2.0 is a light transmittance rating it's that it's a compensated f/1.8 which is why the aperture number is still present (though compensated) and the capital T is present.
    
    (Source, Cinematography - Kris Malkiewics 1973 - Peer Reviewed)
12. Some of the information in this video is totally wrong. F-stop is a measure of the opening of the aperture, a very real measurement. F/2 for a 50mm lens means the opening of the aperture will be 25mm. T stop is the real measurement of the light transmission of the lens at that f-stop.
13. Merry Christmas, mate. Thanks again for an informative video :)
14. This was really good! :D
15. I really love your videos. They are full of the most accurate information on youtube. I've been recommending them to entry level filmmakers. Thanks so much!
16. F-stop is NOT a measurement of light! Many said it, I'll say it again.
    If that's the only you can think of when you think about aperture, then sure, it's a way of controlling light, but it's not a measurement of it.
    Technically, it's the LITERAL apparent size of the entrance pupil as a relation to the focal length. As it is, it controls the amount of light, but does not measure or "estimate" it.
17. your explanations are awesome. please continue.
18. I was honestly just wondering what the difference was yesterday, and today I have it perfectly explained. Thank you!
19. Thank you Sir :) ! Best explanation on youtube
20. Why don't you make a some kind of collab with cinematography database od DSLR Guide? It would help to spread the love of knowledge that you have!