Residual spherical aberrations, the cause of focus shift.
P. S. Maybe Sigma can release a smaaaaaaaaaawwww 35/2 and thus plug the perceived gap in the FE lineup. After all, this is one of the most widely expressed complaints about the status of the lens family......
P. S. Maybe Sigma can release a smaaaaaaaaaawwww 35/2 and thus plug the perceived gap in the FE lineup. After all, this is one of the most widely expressed complaints about the status of the lens family......