ФОТО: 3d-kraft.com
If you remember my article from 2014 about "Bokeh Dreams", you may have noticed the unique bokeh of the Sony 135/2. 8 STF. Now Venus Optics, an ambitious lens manufacturer from China, designed a new "smooth trans focus" potrait lens, the Laowa 105 mm f/2 STF.
STF stands for "Smooth Transition Focus" and was intruduced by Minolta in 1999. It means an optical design with dual diaphragm and an apodization element as shown in this schematic diagram:
Comparing conventional design with smooth trans focus design (source: Venus Optics)
2017-1-5 12:00
