This Rayner Spectroscope looks pretty cool - I cant figure out what the thing around it is for ? Possibly an attachment to a holder? Also would it be a good buy and how much should I offer the seller?
Which would be the better scope to buy considering my previous posting on the R & J Beck spectroscope.
Would it be better to purchase a spectroscope with a scale ?
Many thanks to G4Lab who seems to be answering the technical questions on the stuff I have posted previously .
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Because if you pay attention to what you are doing you can look at any color and identify its wavelength as closely as that scale can.
Because illuminating and focusing the scale are two pain in the neck steps that you really don't need to be doing when trying to use a spectroscope, for gemology.
Because most scale spectroscopes I have seen (numerous), are not well calibrated because you need a real sodium light to do the job. NOT a high pressure sodium which are everywhere, but a low pressure one. Furthermore, if you DO line up the "589 Tick mark" with a sodium double D line, the rest of the scales' accuracy is usually nothing to crow about. Even on ones with pretty fancy names. Of course you need other spectral sources to prove that. (I do have those.)
Everything a gemologist needs to do can be done with the OPL. If you want to buy a scale spectroscope, I probably have a couple I could sell you.
I do have a Kruess I like pretty well. But I don't use the scale. You can put a cover on the scale illuminator and then it acts like a non scale spectroscope.
Just look up a scale of wavelengths that have the colors, with a listing of their wavelength ranges. There aren't that many colors. Red Orange Yellow Green Blue Violet. Just learn the ranges for each color which takes like five seconds. Then you don't need no steenkin scale.
hi G4Lab - thanks for the awsome reply - it has been extremely helpful. I have been offline for a while hence the silence but I would like to take up your offer of the scale spectroscope so i can get used to the scale etc. I am getting an OPL because I have used one in one of my GIA lab classes and liked it - do you suggest I get the stand with it and would the training one be an advantage or should i just stick with the normal OPL ? Many Thanks Alex
What would be really great is a spectroscope-projector combination device that put the gem spectrum image onto a screen so it could easily be compared to an example of a particular gem without any squinting into a tiny aperture.
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