08-04-2017, 06:20 PM
Not sure where the Loawa 105mm STF's aperture is placed.
![[Image: Optical-Structure.jpg]](http://venuslens.googlex.in/wp-content/uploads/2017/03/Optical-Structure.jpg)
The STF element is not that extreme (T3.2 says your review, so 1 1/3rd stop difference compared to the 2 stop of the Sony). Possibly the Loawa has a dark edge from f2 to f2.8, going to no "ND" very fast, where the Sony's transition to "no ND" is much slower? I have not seen, so not looked into, either of the 3 lenses.
The STF element is not that extreme (T3.2 says your review, so 1 1/3rd stop difference compared to the 2 stop of the Sony). Possibly the Loawa has a dark edge from f2 to f2.8, going to no "ND" very fast, where the Sony's transition to "no ND" is much slower? I have not seen, so not looked into, either of the 3 lenses.