This is one of the rare occasions where I can provide an image, which documents the making of the panorama.
I took six images with a fisheye lens. After taking an image the pole was rotated about 60° before I took the next image. As the images were taken with a fisheye lens we were visible in the “nadir” of the final panorama. I retouched “nadir” and “zenith” manually in Photoshop. The real nadir and zenith were left unt(re-)touched as one shot was facing up and one was facing down.
Camera Maker: SONY Camera Model: NEX-7 Exposure Time (sec): 1/640 F-Number: 8 Focal Length (mm): 8 Lens: Sigma 8mm/F4 ISO: 100
As I am aware of the fact, that any combination of lens and body has it's maximum sharpness at a specific aperture I did a series of test images with different apertures to find the maximum sharpness of a Voigtländer Ultra Wide Heliar 12mm/5.6 on a Sony NEX-7.