Originally Posted by Dan Fromm
Hi Dan, I'd probably do what you did, if I knew exactly how (I'm not a cine guy). Whatever it takes to get good exposures.
The old T-stop standard (1960s) considers the lens alone, measuring light in the center of the field with some sort of photo cell vs a lensless standard. (I don't quite follow the method, they say it's explained in the referenced patent, I linked to similar text earlier this thread.) I doubt it will be any help to you for your purposes.
My only quarrel is with calling the exposure adjustment a T-stop if you don't know for sure which components are causing the issue. If you think the lens is solely to blame, then I still have a hard time believing that the glass in a commercial lens might only let ~30% of the light through.
Last edited by Mr Bill; 02-09-2013 at 04:40 AM. Click to view previous post history.