Originally posted by D1N0 Why do you think Tamron did not put out an advisory and Nikon Lenses have no problem with the Df or D5300.
Maybe Tamron lenses have similar issues (with that one particular Nikon model) but Tamron just did not put out an advisory?
The fact that Sigma offers free lens updates to anyone having issues with the Nikon Df does not imply that AF performance was compromised with any earlier camera. It is not proof of the fact that their AF implementation was not up to scratch before.
Originally posted by D1N0 It is not a Myth it is a fact.
I'm sorry, but the fact that a new model breaks compatibility with a third-party product is not proof of sub-standard (and unauthorised) reverse engineering.
Some Metz flash models needed firmware updates to work with new Pentax cameras. Are you saying Metz has sub-standard "retro engineering" as well?
BTW, from a
recent interview with Sigma's CEO Kazuto Yamaki:
"To make a lens for Canon and Nikon, we have to use their bayonet mount and have to use some of their patents. We pay for it."
So if Sigma ever has used protocols without paying license fees that is no longer the case at least for Canon and Nikon.