My astronomy project:
Sigma 150mm f2.8 to use on Star Adventurer mount

Content:

1. Introduction, why use this lens?
2. Vignetting test * (You are here!)
3. Sharpness in corners with star test
4. Canon 6D and Sigma 150mm f2.8 mounted on Star Adventurer
5. Photo on M31 and M45

2: Vignetting test

I have taken photos through a white paper as a diffuser. I used ISO400 and the apertures 2.8, 4.0, 5.6, 8.0, 11.0, 16.0 too see the difference, I compensated the exposures as the aperture shrinks. The software I used for this is, Fitswork for the vignetting graphs and APT for camera control.

Test photos:

Sigma APO 150mm set to ISO 400 aperture 2.8

Sigma APO 150mm set to ISO 400 aperture 4.0

Sigma APO 150mm set to ISO 400 aperture 5.6

Sigma APO 150mm set to ISO 400 aperture 8.0

Sigma APO 150mm set to ISO 400 aperture 11.0

Sigma APO 150mm set to ISO 400 aperture 16.0

My plane is to use the aperture set to 4.0 or maybe 5.6. The corners sharpness will determine which too prefer.