actually it is an industar 96. the 50 i said was supposed to be "50mm range". i'm sorry for being so economical on my words.
i bought it because it is so inexpensive and i've read here an interesting review about it. and also because i already have the componon, wich seems like a very good and trustable lens.
i'm used to the industar. i have an industar-61 (which seems very alike this industar-50U) mounted on my bessa r, and i tried to fit it on the enlarger. first, it is too big - it almost won't fit. and, then, it will not focus! anyway, i just wanted to see what would happen.
but this you said about the grease melting and coming to the lens glass made me shiver!