Ok short backstory, my brother left me some camera gear to baby sit and exercise while he's working in NYC until July next year. One of those systems is of course a Hasselblad 500 C/M with three lenses but I'm using a chrome Zeiss 80 f2.8 circa early 1960s with a lens hood ( I always shoot with the hood). I shot one roll of slide (E100) film and had no issues at all. Two rolls of Neopan Acros 100, different story, I got wicked flare in a few shots. Texting back and forth my brother, he says he never had a problem with this 'blad kit with that lens, so what am I doing wrong?