Graham Line
Well-known
JeremyLangford said:Im worried that a month after I buy an very old MC 16mm f/2.8, the grease or any other thing used to make a lens will go bad. Or maybe there might be dust inside the glass..
Bad grease is more an artifact of the '60s and a couple of later third-party brands. There are a few specific lenses of different brands here and there that have problems, but the MC and MD Minolta lenses are excellent products. Most fisheyes you find won't have had a lot of use but if you're concerned you can go up one grade. A little internal dust doesn't hurt anything.
If you want something you can use for years get the Minolta; if you just want to see how a fisheye/superwide looks and shoot a handful of rolls, go with the cheaper alternatives.
I'm still regularly using lenses from the '70s with no problems.