Where in the hell did you get the absurd idea that we were talking about
scratches? Are you using some kind of lame software that prevents you from
attaching the quote that you're attacking for reference?
Carbon black is an order of magnitude softer than the coatings on your
lenses. It will not abrade them. As to the glass, the hardest substance on
the face of the earth is diamond, followed by quartz, followed by glass. The
idea that uncrystalized loose aggregates of carbon atoms would scratch glass
is laughable. Diamond may be a crystalline form of carbon, but non
crystalline carbon is quite another thing. Uncrystalized carbon (from soot
or whatever) is way down the list.
You cannot remove scratches with carbon black. Period. If what one has is a
scratch, only replacement of the element will cure the problem. Carbon black
will remove many residues adhering to the surface of a lens. Further, it
will absorb some oils which are otherwise nearly impossible to remove. The
"cleaning marks" that looked like scratches that I removed from my lens
were, in reality, not scratches. They were residue similar to mineral water
marks. The coating on the rear element was completely unharmed as revealed
by an even, unperturbed reflection of the original color from the coating.
Carbon black has been used by photographers from Mathew Brady on. This is
not some new invention of mine. I used the carbon black on the advice of a
Pentax trained technician.
Regards,
Bob...
From: "Scooterman" <[EMAIL PROTECTED]>
> I'm coming late to this thread... so excuse me while I catch up.
>
> Why in the world would one want to use this stuff on their $200-$3,000
> lens?? To remove scratches???
You can't. Bad cleaning can, however
> It's an abrasive for sure. Sounds like it's finer than Jewlers Rouge or
> 3,000 grit diamond polish (hard to find lately).
>
> But the last time I checked, most folks aren't proficient at
> grinding/polishing glass.... plus it's still in the body, so you'll get a
> falling off on the polish job at the edges.
>
> And how can one get a lens so deeply scratched that they'd attempt such a
> "repair" theirself?? I saw the posts where some people can't touch a
> camera unless they play Rugby with it... but your favorite lens??
>
> For a source of lamp black... what's the problem with getting an el-cheapo
> kerosene oil lamp & smoke the chimney till ya have enough to do your deed?
> (I collect such lamps, & believe me, it don't take but a minute for em to
> smoke the glass). Which is why I have the questions.... I've rubbed the
> glass chimneys & that (cast) glass don't look a whit better for it.
>
> Does it have to be lamp black?? What about the "old trick" of using
> newsprint on your car windows? Granted, it's an old trick because today's
> papers don't have much (if any) residual ink on em ... and the fiber
> content (rag) is probably so low that's it's akin to your old polyester
> pants.
>
> I dunno about some of the stuff I read on here.... usually, I can get by
> with a lipstick brush & a good, clean, cotton handkerchief... & maybe the
> moisture from my breath (not spit).
>
> Scratching his head in Detroit
> Scoot
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