Thank you timshatz, evangilder, Gnomey, Nonskimmer, sorry for the mixed up with my previous posts.
I notice something about my pictures. The copies on paper are just find and
not grainy even if I used 400 ASA 135mm films.
But the scanned images from negatives are giving these grainy images on
the screen.
I am wondering what would happened if I used 100 ASA films instead?
Should I also get images grainy like that once scanned?
I have to try it. But difference between 400 ASA and 100 ASA is 2 stops less
opening the f stops and then restrict depth of field...
Maybe the rull of thumb is what is taken with conventionnal films has to go
on paper, period...
Pierre