p.1 #3 · Can I use my Sony E mount lenses on NIKON D 810A DSLR ?
Just to expand a bit on what Scott already mentioned, even if an adaptor existed, it would put the lens inside of the Nikon lens mount so far the mirror would smack the rear element of the Sony E-mount lens.
When mirrorless cameras dropped the mirror from the DSLR designs, they were able to mount the lenses closer to the sensor and make smaller cameras because there is no moving mirror to work around.
