I have this issue as a buyer too. Sellers have all the time in the world to research some outright delusional prices for their products(I'm not going to pay 100€ for a 1980s 200mm F3.5) but can not check which mount the lens they've got is for. It's not just private sellers doing this, even commercial ones too. This also goes for basic information about the condition of the lens. I always have to ask how well the focus ring turns, if there is fungus, mold or dust Inside the lens. It's maddening.
I have this issue as a buyer too. Sellers have all the time in the world to research some outright delusional prices for their products(I'm not going to pay 100€ for a 1980s 200mm F3.5) but can not check which mount the lens they've got is for. It's not just private sellers doing this, even commercial ones too. This also goes for basic information about the condition of the lens. I always have to ask how well the focus ring turns, if there is fungus, mold or dust Inside the lens. It's maddening.