Stylus Evaluation Imaging

the thin end of the wedge
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TA

Re: Stylus Evaluation Imaging

Post by TA » 17 Jan 2017 20:58

ray_parkhurst wrote:In the "Microscope?" thread (viewtopic.php?f=19&t=92795 I posted some images of stylus tips showing the contact points and shapes as viewed directly down at the stylus tip, with lighting at the correct angles and placements to show contact shape and any wear patterns. Rather than hijacking that thread further, I figured I'd start my own. You can view my early attempts on JICO N97LTDE and Shure N92LT styli, with explanation of the photo technique, over on the Microscope? thread.

First stylus I will show here is a well-worn Shure M99E. This stylus is so worn that the tip now rides all the way to the bottom of the groove! The fairly polished elliptical flats on this stylus were transparent enough that the surfaces did not image well, and this confused the stacking program in those areas. But the wear pattern is unmistakable, and that's the interesting part of this image:

http://i943.photobucket.com/albums/ad27 ... M99E_F.jpg
Impressive images. I just wonder how such a worn stylus would look like in the traditional USB microscopes used. I have no such worn stylus to view, and even old stylii does not show signs of such wear.

New stylii:
https://dl.dropboxusercontent.com/u/110 ... 12_007.jpg
https://dl.dropboxusercontent.com/u/110 ... 12_009.jpg

Old one, but how worn? - that is the question.
https://dl.dropboxusercontent.com/u/110 ... 12_006.jpg
https://dl.dropboxusercontent.com/u/110 ... 12_004.jpg
https://dl.dropboxusercontent.com/u/110 ... 12_003.jpg

aj1969
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Re: Stylus Evaluation Imaging

Post by aj1969 » 17 Jan 2017 22:09

Just an unbranded 8LED Digital USB Microscope Endoscope Magnifier Camera 20x800 about £15 if i remember of fleebay came from the far east but i bet most of them do and lots of time trying to get it into focus!!. i would like to find an auto focus one so i could try stacking the pics but thats out of my budget. And those pics above are superb scho2684

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Re: Stylus Evaluation Imaging

Post by chiz » 18 Jan 2017 01:42

ray_parkhurst wrote:You can do pretty well with an even cheaper system. What I quoted was what I'm using (optical chain anyway) but a more budget system (~$250), which would take nearly as good images as I am showing, would be:

Canon Rebel XS Camera, $100 used on eBay:
http://www.ebay.com/itm/201783937038?_t ... EBIDX%3AIT

EOS-M42 Adapter, $4 new on eBay:
http://www.ebay.com/itm/M42-Lens-to-Can ... Sw3xJVVAZd

M42 Teleconverter, $4 used on eBay:
http://www.ebay.com/itm/VIVITAR-Vintage ... Sw2xRYSM6D

M42 Extensions, $8 new on eBay:
http://www.ebay.com/itm/Macro-Extension ... DryT2bR0yQ

M42-RMS adapter, $22.50 new on eBay:
http://www.ebay.com/itm/361518879207?ss ... Track=true

Bausch & Lomb 10x Microscope Objective, $20 used on eBay:
http://www.ebay.com/itm/Bausch-Lomb-10x ... SwImpXpNgn

Z-Stage, $55 new on eBay:
http://www.ebay.com/itm/Z-axis-Precisio ... SwiYFXHrp8

Jansjo LED Lamps, $10 new at IKEA (need 2):
http://www.ikea.com/us/en/catalog/products/20169658/

Macro Stand, $15 new on eBay (warning, I have not evaluated this one):
http://www.ebay.com/itm/New-Ball-Head-C ... xyQQRR7qCR
Ray, many thanks for taking the time to recommend that kit. I’m not sure I’m ready to jump to that level yet but when I am I will definitely follow your advice.
aj1969 wrote:Just an unbranded 8LED Digital USB Microscope Endoscope Magnifier Camera 20x800 about £15 if i remember of fleebay came from the far east but i bet most of them do and lots of time trying to get it into focus!!
Thanks for the info aj1969, that may be similar to what I have so maybe it’s my photography skills that are lacking rather than the tools or I just need more patience.

scho2684 and Thomas_A – very nice shots too.

This is the best I’ve got so far, I was surprised how much more glue there was than diamond:

3717037169

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Re: Stylus Evaluation Imaging

Post by ripblade » 19 Jan 2017 02:26

It's possible to obtain similar results for much lower outlay using a student microscope with a CCD camera head. The image stacking is a new one on me though. Will have to try it soon. The images are very impressive!

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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 19 Jan 2017 03:44

ripblade wrote:It's possible to obtain similar results for much lower outlay using a student microscope with a CCD camera head. The image stacking is a new one on me though. Will have to try it soon. The images are very impressive!
The two key elements are the objective and the camera. A CCD camera will do a good job, and most have no shutter and of course no mirror so they can produce vibration-free images. The objective of student grade microscopes are generally quite good at the center, but have poor coverage, so the image will be sharp in the middle and blurry at the edges. Stacking can recover some of this because some of the blurriness is due to non-flat field nature of the more inexpensive objectives. So the end result will be somewhere between the result I'm showing and the USB images others are showing.

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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 20 Jan 2017 16:13

I received my N110HE JICO NEO SAS/S yesterday and took a top-down image to show the contact surfaces. They look very good! It looks like the diamond is aligned within 1-degree. I'll take an overall image to show the general "look" of the stylus but I wanted to get the contact surface image done before I start listening to it. Note this is same magnification as previous images...this stylus and the sapphire cantilever are very small:

http://i943.photobucket.com/albums/ad27 ... ass_f1.jpg

TA

Re: Stylus Evaluation Imaging

Post by TA » 20 Jan 2017 19:03

Very nice picture. And I agree that the SAS stylii have exceptional precision in their build quality and geometry. The SAS I have shows an extreme symmetry in tip and stylus and and both channel balance and channel crosstalk is the best I've ever measured in my system.

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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 21 Jan 2017 03:18

Here's a shot of the JICO N110HE NEO-SAS/S showing whole stylus and end of cantilever. I reflected a secondary light off the contact surfaces. This is a beautiful stylus and now I'm going to give it a listen...

http://i943.photobucket.com/albums/ad27 ... sass_f.jpg

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Re: Stylus Evaluation Imaging

Post by scho2684 » 21 Jan 2017 08:45

Very nice shot, and most interesting the shot from above (that is one hell of a good assemblage! my Dynavector was off at least 5.5 degrees)

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Re: Stylus Evaluation Imaging

Post by aj1969 » 21 Jan 2017 12:42

All i can say is there amazing shots. do you have some sort of auto focus for stacking the pics. i assume you take one frame auto focus then it re focuses slightly lower takes another frame and so on?

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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 21 Jan 2017 13:28

aj1969 wrote:All i can say is there amazing shots. do you have some sort of auto focus for stacking the pics. i assume you take one frame auto focus then it re focuses slightly lower takes another frame and so on?
This shot used a 10x Nikon objective, so no autofocus at all. I set the initial and end focal planes and the step size using software that controls an automated Z-stage. The last shot consisted of 29 images taken at a step size of 15um.

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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 22 Jan 2017 01:18

Here is my Shure N110HE with straight (not telescoping/tapered) cantilever. This is after ~100 hours of play. I can't see any noticeable wear:

http://i943.photobucket.com/albums/ad27 ... E_1a_A.jpg

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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 23 Jan 2017 04:57

Same time I bought the N110HE NEO SAS/S I also picked up a couple other styli to try, including a replacement for the N99E that I pictured earlier in this thread. Here's the JICO replacement...

http://i943.photobucket.com/albums/ad27 ... 9E_A_A.jpg

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Re: Stylus Evaluation Imaging

Post by ray_parkhurst » 28 Jan 2017 21:51

Along with the N110HE NEO SAS/S, I bought a standard N110HE from JICO. Here it is, using a slightly different configuration. Rather than showing both contact surfaces simultaneously by reflecting light off both sides, I have placed the cartridge in a jig that holds it at 45-deg. This puts one contact surface planar to the camera sensor. By using a ring light, the light "encircles" the contact surface, which appears as a dark area encircled by the reflected ringlight.

Unfortunately, this technique requires two images rather than one. I have spliced the two images together in the composite below.

The new stylus is showing unequal contact areas Left/Right, but I expect that as the stylus begins to wear, the actual contact areas will grow slightly to encompass the whole polished area of the tip and will become more equal.

http://i943.photobucket.com/albums/ad27 ... 20LR_A.jpg

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Re: Stylus Evaluation Imaging

Post by ripblade » 28 Jan 2017 22:20

^ How many hours on that tip?

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