Re: Will Canon allow EF lenses to work on future RF bodies?
Distinctly Average wrote:
Sittatunga wrote:
EmotionBlur wrote:
Sittatunga wrote:
Having said that, I can't find an instance where Canon have ever licensed the EF lens patents for stills camera lenses; all the third-party manufacturers have had to reverse engineer their lenses. So I'm sure that "something" is one of them managing to produce an RF mount lens that doesn't infringe Canon's patents.
So far, bad luck. Unlike EF mount, it seems that the AF patent can't be bypassed so easily. Rokinon/Samyang had to pull some of their RF mount AF lenses because of that.
It's not necessarily going to be quick. In 2016, nearly 30 years after they launched EF lenses, Canon were warning people not to use Sigma Art lenses with peripheral illumination correction enabled because of those odd concentric circles that produced. Canon aren't likely to help with reverse engineering either as gettingthat right isn't Canon's problem at all. .
The peripheral illumination was understandable though. It wasn’t just ART lenses, but really all third party lenses that you couldn’t use the built in body correction for. Each lens had its own profile for the correction. Should Canon have tested and created profiles for every third party lens? It was always my opinion this was better done in post anyway.
It generally happened to a lens set to a wider aperture than was available to the lens that it had identified itself to the camera as. Misrepresentation of a lens's identity can also lead to spectacular fails with respect to IBIS. Sigma have finally worked out how Canon's correction profiling works, but no, Canon should definitely not create profiles for every third party lens. What a temptation to mischief that would be.