Created by "Bill Hancox" on 30/01/2014 01:44:01
Smearing?? on the raceways. Interesting bubbly things on my raceways that were not visible through a 10X loupe. A multi-coated Maruni, variable neutral density lense filter mounted on a 50 mm macro lense made them stand out by amplifying the contrast. Filter was set at about ND4-ND5.
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