Today I tested my sigma 60-600mm lens and I was really disappointed by the quality of the images produced.
I use a Nikon Z6ii and the FTZ (v1) adapter and everything is fine with my other F-mount lenses. But with the Sigman 60-600 it is impossible to get any image with a minimum of sharpness. I tested the automatic focus and the manual focus but nothing works.
I have tested several apertures and I have the strong impression that this has no effect on the sharpness of the images produced.
Do you know what could help me to know what's going on? I'm not sure if it's a faulty lens, or a bad compatibility between the Z6ii and the sigma 60-600? (quickly tested on a D7100 and got the same results so I don't think that's it)
Here is a sample image:
EXIF: F/6.3 - ISO 100 - 1/1250 - 600mm. I used a tripod, no teleconverter, for the manual focus I used the in view magnification (the + loop sign) and focused right in the middle. Lens image stabilization was set to off.