>>3621053>For 2 groups then the total transmittance will be (0.92*0.99)^2≈0.83, and hence the T-stop around f-stop/0.91.That's a lot better than I was getting (f/0.937 and T/1.093) from eyeballing it.
>Btw was your lens an old projection or super-8 lens?I sourced them out of a few different Bell & Howell and off brand f/1.2 to f/1.6 projector lenses. This is what the test bed looks like so far.
