Thomas Smet
Veteran
I'm not so sure. This is intercompany issue, not intracompany like the articles you referenced. Samyang is Korean. They could probably sue if they could prove intentional crippling? And if it were a logic bomb, why not disable eye AF as well? That's rock solid on the Samyangs. I admit that I don't have a plausible explanation, but I'm not totally sold
you also see other behaviors that differ that I thought would have been decided by the camera. Such as AF transition speeds operating differently on different lenses. One lens might need a higher value to achieve the same speed of transition as a different lens
Its the whole system and multiple factors. Thats why I still consider DSLR AF still kind of hit or miss. DPAF is a massive improvement and makes it 100x better but its still not 100% perfect and yes the lens will make a difference. As will the copy of the lens. The type and brand of adapter will make a difference as well along with body, adapter and lens firmware. Its a hot ugly firmware juggling act.

