Yashica AF 75-300 1:4.5-5.6 Any Information?

Hi, Agnieszka, and welcome to the forum!

I can't help you (yet) with your request although I happen to own such a lens (once got it as an eBay 'by-catch', together with a 230AF). Seems the only way we can find out more is to put it to use as there really is not much info to be found on this zoom (could be Sigma-made though). I shall take your request as a reminder and incentive to test this lens as soon as I find the time.

cheers

Michael