if you look closely, it's a crosshatch pattern, it looks like someone took an abrasive material to a couple of different layers of glass, maybe it's a disassembly and failed cleaning attempt?
if it's oil you'll want something like ror and kimwipes, because ror has a surfactant that lifts oil, the alcohol-only cleaners don't work nearly as well for oil, use them after the ror cleaning... see the ror msds: http://www.ror.net/product/material-safety-data-sheet/
if you are going to be buying legacy lenses, you really need some cheap tools for disassembly and cleaning.
my go/no go on something like this is to first test for decentering/soft sides, if it's weak on a side, i'm not going to gamble with disassembly in order to clean, it goes back.
dan
if it's oil you'll want something like ror and kimwipes, because ror has a surfactant that lifts oil, the alcohol-only cleaners don't work nearly as well for oil, use them after the ror cleaning... see the ror msds: http://www.ror.net/product/material-safety-data-sheet/
if you are going to be buying legacy lenses, you really need some cheap tools for disassembly and cleaning.
my go/no go on something like this is to first test for decentering/soft sides, if it's weak on a side, i'm not going to gamble with disassembly in order to clean, it goes back.
--
dan
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