Mountaindewfountain

Hello fellow anamorphic friends, I recently received a kowa 16h and helios 44-2 combo with fvd single focus adapter, when I use this on my EOS M I can get sharp images wide open but for some reason I just can't focus at all with my a7iv unless I Cloe my aperature, any idea on why this would be happening? 🙏 Thanks!