I am amazed by the difference of luminosity between the ground glasses of my two view cameras. Both have normal GG, not fresnel or anything special, and the most luminous of the two has a lens that only opens to f/8, while the darker one opens to f/4.5. So, what's the difference? The difference of grinding can only account for so much difference, so I suppose that the GG of the murkier one must be dirty, covered with athmospheric goo, cigarette smoke and whatever else, accumulated over 75 years or so.
Is this a reasonable assumptions? And if yes, how would you clean a GG to restore it to its original luminosity (cleaning products, type of cloth, etc). A GG isn't that precious but it sounds silly to buy one.
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