Hi there!
I'm starting to extensively use a Super-Multi-Coated 50mm f1.4 Takumar as a route lens for my K10D. I really love this lens and I'm trying to master its use and know all its guts.
As I shoot, I have in my head all the DoF and hyperfocal numbers (or at least most of them)
, so I know what is going on with the shot.
My main question is that this lens, apart of the range of f-stops (1.4 - 2 - 2.8 - 4 - 5.6 - 8 - 11 - 16) has half-stops, and I wonder if the relation of those is just half the difference between them (i.e: 1.7 - 2.4 - 3.4 - 4.8 - 6.8 - 9.5 - 13.5), or the relation is a non-linear one, as the normal f stops don't follow a linear progression as well.
I would like to know that so I can calculate the changes on the DoF and hyperfocal values for the half steps as well.
Thanks a lot for your help!