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Sunstar Rendering
The Voigtlander 50mm f/1 Nokton is capable of defined sunstars starting at f/2.8 and best from f/4 until f/11. The sunstars will have 12 points since the lens is equipped with a 12-blade aperture mechanism (straight blades)
For this test, I used selected the Leica Noctilux 1:1/50mm lens profile, so we can have an idea of how vignetting is corrected in-camera. So, expect real vignetting from the lens to be way higher than this. (not a vignetting test)
Here is a sequence from f/1 until f/16 in full stop increments:
(It did really well in regards to ghosting and veiling flare with the sun in the frame!)

F1
LEICA M10-R Noctilux-M 1:1/50 lens 50mm f/1.7 1/2000s 100 ISO -1.3 EV

F1.4
LEICA M10-R Noctilux-M 1:1/50 lens 50mm f/1.7 1/2000s 100 ISO -1.3 EV

F2
LEICA M10-R Noctilux-M 1:1/50 lens 50mm f/2.4 1/750s 100 ISO -1.3 EV

F2.8
LEICA M10-R Noctilux-M 1:1/50 lens 50mm f/4.0 1/500s 100 ISO -1.3 EV

F4
LEICA M10-R Noctilux-M 1:1/50 lens 50mm f/4.8 1/250s 100 ISO -1.3 EV

F5.6
LEICA M10-R Noctilux-M 1:1/50 lens 50mm f/6.8 1/125s 100 ISO -1.3 EV

F8
LEICA M10-R Noctilux-M 1:1/50 lens 50mm f/8.0 1/60s 100 ISO -1.3 EV

F11
LEICA M10-R Noctilux-M 1:1/50 lens 50mm f/11.0 1/30s 100 ISO -1.3 EV

F16
LEICA M10-R Noctilux-M 1:1/50 lens 50mm f/16.0 1/15s 100 ISO -1.3 EV