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 Replies: 27 / Views: 3,929 |
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Pillar of the Community
United States
4038 Posts |
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Pillar of the Community
 United States
4038 Posts |
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Pillar of the Community
United States
5825 Posts |
VERY nice photography!
Are the ones at the top stereo pairs?
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Pillar of the Community
United States
4038 Posts |
Yes, cross-eye stereo pairs. I think the angle is a bit too wide. I may re-render the RPM with a higher magnification and lower angle to see if it will be easier to view...Ray
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Pillar of the Community
United States
4038 Posts |
Contact me for photographic equipment or visit my home page at: http://macrocoins.com |
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Pillar of the Community
United States
4038 Posts |
Here's a less dramatic but less common RPM...1956-D RPM#4 in single view and stereo:   |
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Pillar of the Community
United States
2815 Posts |
Incredible images!   |
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Pillar of the Community
United States
9792 Posts |
Cool stuff Ray!
"Buy the Book Before You Buy the Coin" - Aaron R. Feldman - "And read it" - Me 2013! ANA Life Member #3288 in good standing since 1981, ANS, Early American Coppers Member (EAC), Colonial Coin Collectors Club member (C4), Conder Token Collector Club member (CTCC), Civil War Token Society (CWTS) member, Liberty Seated Collectors Club (LSCC) & Numismatic Bibliomania Society member (NBS), USMex, Member in good standing, 2¢ variety collector. See my want page: http://goccf.com/t/140440 |
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Pillar of the Community
United States
4038 Posts |
Here's an extreme side view...  Contact me for photographic equipment or visit my home page at: http://macrocoins.com |
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Moderator
United States
23522 Posts |
OK, I have to know: How many images did it take to get these stacks? You're moving the goalposts faster than we can keep up, Ray.  |
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Pillar of the Community
United States
4038 Posts |
Pretty cool, isn't it? I actually think this is more than just a gimmick. I'm spatially resolving better than I can with a stereo microscope. Even with a stereo microscope at high magnification, I never saw the sharp "V" detail on the secondary mintmark inside the primary on the RPM#4.
But you're right SD, it does require a lot of images to make this happen. The last image was a 36 shot stack, and the step size was very small and uniform. So as you can tell I have some new equipment I'm testing out...
Contact me for photographic equipment or visit my home page at: http://macrocoins.com |
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Bedrock of the Community
Australia
21788 Posts |
Brings me back to the very first days of my employment in my very first career job.
I was looking at stereo pairs of aerial photographs for water catchment and bush fire protection management.
I was employed as a land management survey draftsman.
Excellent stereo photomicrography.
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Moderator
United States
23522 Posts |
Quote:
So as you can tell I have some new equipment I'm testing out... You got a StackShot, didn't you? You're doing it again, Ray. This is a sea change in variety identification; the available detail with this technique will differentiate even the closest similar RPM's and overdates. It'll also extend the ability to attribute even worn coins with less-than-full detail remaining. |
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Pillar of the Community
United States
4038 Posts |
Quote:
You got a StackShot, didn't you? Almost...I actually traded a lens for a custom-made vertical stacking setup. A guy wanted a Printing-Nikkor and had electromechanical skills to offer, so we traded. I was not happy with the accuracy and step size limitations of the StackShot (reading about it, not testing) and this guy recommended a Trinamic stepper and a fine-pitch linear stage with nominally 5x the resolution. I was thinking about doing higher magnification stacking (50x) but never did get going with it. Turns out the small step size is required for high accuracy 3D rendering at lower mags, so here's the result. And as you can imagine the optics are special as well, not just your run of the mill high res objectives... edited to add...this is done with 5 microstep spacing per image, so in theory I could get 180 images in the stack if needed...but my objective isn't THAT good... Edited by rmpsrpms
10/25/2013 09:59 am
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Pillar of the Community
United States
627 Posts |
Phenomenal!! I have nothing further of import to add. |
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Moderator
United States
23522 Posts |
"A StackShot didn't have enough resolution." The geek in me is giggling uncontrollably at this. |
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Replies: 27 / Views: 3,929 |
Posted 10/24/2013 8:08 pm
