Thanks for all replies. I clearly understood , I cant change ASA of film , thank you for clearing this.
ic racer ,
Cine gels are good , I was thinking they were expensive for me , may be I can figure a gel or glass filter for the narrow back of the lens.
But I have to stay in one digit expense like EDU, 120, 100 ASA, BW Film costs less than 3 dollars. Paper is difficult to store and Ilford Positive 4x5 ,25 Sheet paper cost me 18 dollars and makes 50 positives , not possible to roll as John said , and for same price Arista edu makes 70 bigger negatives and as a roll.
I will use Gustaf route for Cosina SLR.
Thank you all,