How to evaluate the lens of Laowa STF 105mm f2.0

105mm is a lens with STF function. An optical element called apodization filter is installed near the aperture of STF lens, which increases the luminous flux in the central part of the lens, but decreases as it moves to the periphery. Therefore, the contour fades in the out-of-focus imaging part, forming an ideal soft virtual image.

The f value of the aperture represents not the amount of light, but a ratio, and the t value will actually reduce the amount of light because of apodization filter. All lenses with STF function are like this, not domestic questions, so please confirm whether you understand before answering questions, and don't blindly answer questions.