[JJ_SO]

Sorry, again I think all this DOF comparisons, pretending to be a value to calculate with, are rather useless. All this values you get out of your iPhone DoF calculators appear to be accurate because the numbers have some commas in. In practice, nobody would see a difference. Nobody gets a lens like this because of equivalent DOF, as the bokeh is pretty much different to most other lenses and in my eyes the only reason one goes for this otherwise not breathtaking lens. At this price, one gets a 50mm Sigma and a 35 as well and both are better in terms of resolution wide open. Could not believe it, but the difference of two (2!) outstanding (!) Sigma lenses to this very "instanding" Nikkor is less than 50$  :blink:

 

So, it's baiscally the speed of f/1.4. But if I insist on "DOF not relevant as reason for decision", I need to add f/1.4 is not necessarily for all lenses the exact same speed as some have higher or lower light transmission. I noticed that with the Sigmas f/1.4 I get somewhat faster shutterspeeds because light transmission appears to be a bit higher.