Hi, First, are your pics from a digital microscope? How much does a high quality image cost in terms of hardware? I bought a hand-held digital and it was hopeless.
I experimented with lighting periodically for years. 200W projector lamps with variable power supply, flashlights, and also red lamps. The light going inside the diamond and manifesting in the wrong place is a problem. The red lights had good results, but they were hand held so position could not be maintained.
The pics are 60X which is the lowest power and the only one that is usable.
Fading of the light with magnification is a huge problem.
These lamps are LED desk lamps I found at Target for $5 each. They seemed to have a good dispersion of light so I gave them a try. I moved them around until I obtained what I thought was the best reflection obtainable.
I have seen a B&L professional stereo stylus microscope and was given the opportunity to look into it. The turntable is rotated until the reflection appears.
Actually, the best non-digital way that I have found to examine stylus wear is to take a 10X loupe and move it around under a light while looking through the loupe. A reflection can be seen when in the right position. It takes some experience and I wanted to use a microscope to see how close my evaluations were.
The diagram sent by Ray P is very correct and impossible to do.
What you're looking for is to see the light reflecting EXACTLY off the 45-deg and 135-deg contacts from light coming in at 0-deg and 180-deg.
Positioning the stylus is quite difficult. Getting the stylus as close to normal to the platform as is possible is all that seems to be practical. Then move the lamps around until the best reflection is obtained.
These lamps have a lens that disperses the light so that positioning is possible. I recall that the B&L stereo scope had very expensive special bulbs. Perhaps they dispersed light such as to keep from getting an overpowering beam.
Thanks for the replies. I will appreciate any suggestions. This setup is the first one that gave usable results. The reflection is in high contrast to the whole diamond. Regards, Mark