T Stop of Canon Lenses

Hi all , sorry for what is perhaps an inconsequential thread , just something that piqued my curiosity .

I am trying to find a site or table of Canon lenses that gives the aperture value in T Stops rather than F Stops .
Tried Googling and searching , but it returns a hit from content such as "can't stop" , amongst other useless things (Google has really gone down the can) .

Cheers for any help or pointers .

After a super fast google search and clicking a random result..

http://thephotoletaria​t.com/f-stops-vs-t-stops-explained/

DxO mark: http://www.dxomark.com …ngs/Optical-Metric-Scores

Typically, a good modern prime lens will have a T-stop that's about 0.2 stops slower than the rated F-stop; so f/1.2 is t/1.4, f/1.4 is t/1.6, etc. It gets relatively worse with older uncoated lenses, zooms, and lenses with heavy vignetting.

Cheers guys !
I had a look at DXO too ... eek .

Seems to be a fixed percentile of the max aperture , I though that a zoom would be worse than a prime , but seems about the same .
Pity that DXO has only tested some of the canon line up , but there ya go .

Cheers again

Use Google's (well-hidden) verbatim search and some quotes to get a space in front of the t:

https://www.google.com …b4c158e2&biw=12​74&bih=912

uOpt wrote in post #15882130
Use Google's (well-hidden) verbatim search and some quotes to get a space in front of the t:

https://www.google.com …b4c158e2&biw=12​74&bih=912

Excellent !
I didn't think to put the space before the quotes , thanks for the tip .

On an unrelated note , that may raise a giggle .....
Dug out the camera (after decorating house) , fancied a walk in the wilderness .
Couple of hours later ...... now where the fek is that charger ?

Arrg :P

Did you ever find a chart? Im trying to find one now and not having much luck.

I was testing out my canon 50mm F1.8 and canon 50mm F1.4 lenses and noticed the 1.4 seems to be 0.3 stops faster at 1.8 than the 1.8. Was curious what their actual t stops were.

Interestingly, there is an article that shows that the light loss with a lens is very DEPENDENT upon which sensor it is used with!
http://www.luminous-landscape.com …amera_manufactu​rers.shtml