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03/06/2006 02:58:24 PM · #1 |
Some cameras have this clear tint on the front of the lens, what is it? panasonic and sony has a green color, canon has a purple color. Does it do anything? if you use a solution like alcohol you can kinda wipe it off but then it just kinda grows back after a while. Sometimes it looks greesy. Sometimes it spots
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03/06/2006 03:02:21 PM · #2 |
Ectoplasm.
!!!!!!!!!!!! IT CANNOT BE DESTROYED !!!!!!!!!!!!!!
Either that or some kind of coating :-)
Originally posted by BowerR64:
Some cameras have this clear tint on the front of the lens, what is it? panasonic and sony has a green color, canon has a purple color. Does it do anything? if you use a solution like alcohol you can kinda wipe it off but then it just kinda grows back after a while. Sometimes it looks greesy. Sometimes it spots |
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03/06/2006 03:03:59 PM · #3 |
Camera lenses are multi-coated to improve light transmission and reduce flare. That coating is what gives a green or purple tint. DO NOT TRY TO REMOVE IT! You'd be ruining your camera. Some info HERE.
Message edited by author 2006-03-06 15:09:24. |
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03/06/2006 04:11:52 PM · #4 |
What Scalvert said!
BTW, it's a VERY thin coating... the color that it appears to be has to do with its thickness and the wavelength of light.
If you apply a liquid, you "hide" the coating, and when the liquid dries it again appears. Modern coatings are relatively hard, and highly solvent resistant.
BTW, if you have spots or smears that are not easily removed with alcohol, moisten a lens wipe with distilled water, clean the surface gently, then follow immediately with a cleaning with alchol. Some spots are not soluble in alcohol but *are* soluble in water.
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03/06/2006 05:29:30 PM · #5 |
I'm pretty sure a Brillo pad will take it off;)
Sorry for being ridiculous. Just wanted to see how many cringes I could elicit. |
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03/06/2006 05:42:39 PM · #6 |
Originally posted by greatandsmall:
Just wanted to see how many cringes I could elicit. |
At least one. |
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03/06/2006 07:25:40 PM · #7 |
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03/06/2006 07:41:11 PM · #8 |
| These very thin films are usually vapor deposited magnesium flouride which forms a dielectric coating whose wavelength admission or rejection characteristics are dependent on the thickness. Various manufacturers use different thicknesses, each thinking they have exclusive insight into which wavelengths are best to accept and reject. The primary purpose of the coatings is anti-reflection to improve the light transmission (reduces losses). One essential place that such a coating is used is on the sensor cover glass which has an infrared reject (hot mirror) coating to reduce the effect of ir light on the image. Quantum physics at work! Ain't science wonderful? |
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03/06/2006 10:42:48 PM · #9 |
So there is no better or best coating? How come the filters that you can get dont have this coating on them? they just look shards dark?
Message edited by author 2006-03-06 22:44:04.
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03/06/2006 10:44:23 PM · #10 |
Originally posted by BowerR64:
Some cameras have this clear tint on the front of the lens, what is it? panasonic and sony has a green color, canon has a purple color. Does it do anything? |
Darth Maul, Darth Vader has red sabers, Yoda has a green one, Luke has a green one too, some has purple, some has blue... why? |
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03/07/2006 07:55:20 PM · #11 |
ok ok i get the point. I just thought it had somthing to do with the quality of the lens or somthing that helps the image. Im learning give me a break.
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03/07/2006 08:38:59 PM · #12 |
Originally posted by BowerR64:
Im learning give me a break. |
If you were referring to my comments, they were meant as a joke :)
hope you're not offended. I do get a little crappy sometimes, hehe |
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03/07/2006 08:58:22 PM · #13 |
| Crayon, these lens coatings are very important to image quality. Among other things, the coatings help reduce chromatic abberrations and lens flare. If you have not looked through an optical instrument that does not have coated optics, then perhaps it is difficult to appreciate the difference the coatings make. It is especially important when there are many lens elements in the optical assembly, such as a camera lens. Without an anti-reflective coating a lens can reflect as much as 12% of the incident light per surface. If the lens assembly has 15 elements that is 30 surfaces, losing 10-12% of the light striking each surface! That would make todays complex lens assemblies nearly impossible to produce without the lens coatings, as the light losses would be unacceptable. |
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03/07/2006 10:12:48 PM · #14 |
Well ive messed with it in the past on glasses but not camera lenses and its like it grows or somthing. I remember cleaning some oakley sunglasses that had a glare that looks similar to the lenses and when i first whiped it away i thought it was ruined and that i had whiped the neat looking purple glare off the lense but then it seem to just kinda grow back once the chemical drys. I remember touching the lense with oily fingers and then trying to whipe the oil off seem to intensify the color or somthing. It was really strange, so i wondered if there was anything to this coating that lets in certin kind of light or certin colors or somthing. I thought there was a technical part to it or somthing.
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03/07/2006 10:24:45 PM · #15 |
Originally posted by marksimms:
Ectoplasm.
!!!!!!!!!!!! IT CANNOT BE DESTROYED !!!!!!!!!!!!!!
Either that or some kind of coating :-)
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Yup! In fact I got it all over my lens after this picture!
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03/07/2006 10:42:52 PM · #16 |
Originally posted by BowerR64:
How come the filters that you can get dont have this coating on them? |
Many of the higher quality filters do, particularly those with multiple glass surfaces like circular polarizers. |
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03/07/2006 11:42:14 PM · #17 |
Originally posted by greatandsmall:
I'm pretty sure a Brillo pad will take it off;)
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I suggest sandpaper. That's always worked for me.
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03/07/2006 11:44:58 PM · #18 |
Originally posted by Spazmo99:
Originally posted by greatandsmall:
I'm pretty sure a Brillo pad will take it off;)
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I suggest sandpaper. That's always worked for me. |
My grinder girl can take that stuff off for ya ;-)
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