i have spent 15 minutes using the search feature but could not get a relevant response, although i know there are threads regarding this issue, which is how to take spherical panoramas using a nikon 14-24 2.8 zoom lens, i have a M1 with the rd16 base, am keen to upgrade both upper and lower rotators at some point, i have to get the nadir accessory, so if someone can point me to a guide or something that would be great.