Polarised lenses

[rajpoot]

So I bought a pair of polarised sunglasses recently (:verycool:), and I remember reading in passing somewhere that there are three qualities of polarised lenses, P1, P2 and P3, from the oldest to the newest. I've been trying to figure out what lenses do my pair have but nothing is specified on the little 'manual' that came with them, and for once even my Google skills have failed me. I called and asked the dealer I bought them from and he appeared to be incapable of understanding my question.
Thus I now turn to the patrons of the Org in search of knowledge. I'll be grateful if any one here can tell me what exactly is the difference between the three qualities of polarised lenses and what quality does my model (RB3025 1/58) have.

[Ibrahim]

So I bought a pair of polarised sunglasses recently (:verycool:), and I remember reading in passing somewhere that there are three qualities of polarised lenses, P1, P2 and P3, from the oldest to the newest. I've been trying to figure out what lenses do my pair have but nothing is specified on the little 'manual' that came with them, and for once even my Google skills have failed me. I called and asked the dealer I bought them from and he appeared to be incapable of understanding my question.
Thus I now turn to the patrons of the Org in search of knowledge. I'll be grateful if any one here can tell me what exactly is the difference between the three qualities of polarised lenses and what quality does my model (RB3025 1/58) have.

don't take my word on it (it comes from my experience in using polarizers), but I think it just means you have three polarizing lens layers (or however you call it) that are crossed with each other to cut the glare. (p is IIRC short for "polarizer"). Though it's making curious as to the angles used when aligning the three layers...
for example: most petrographic microscopes (http://en.wikipedia.org/wiki/Petrographic_microscope) (all the ones I know and have used at least), have two polarizers that can be moved and removed, and cross each other at 90 degrees, for mineralogical analyses.

now, one place I know there is p1, p2, and p3, is in certain target polarizations--but that has nothing to do (if at all) with sunglasses. (http://wwwkph.kph.uni-mainz.de/MAID//dmt/target.html)

as to your model of glasses? I dunno.

[Tellos Athenaios]

Polarised lenses? Thought it's always a "filter". Depending on the number of filters and angles you can filter a percentage of all incoming light, with two at 90° angles being a common configuration to remove all external light if you want to study e.g. spectrometry or store certain chemicals.

Polarised essentially means: "has very thin, deep black lines on it". Of course quality of the filters might well vary (i.e how black are the lines, and how thick do they need to be).

[rajpoot]

Well I've been going for afternoon walks along one of the nearby lakes (partly because its winter and partly to show off the shades) and the lenses cut out the glare quite well.

I guess the chances of finding out how many polarising lines they have are not bright, but anyhow thanks for the info. :yes: