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Messages - slomoshun

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1
Gemstone Faceting / Re: Photographing faceted stones.
« on: August 21, 2020, 10:40:43 AM »
Quote
A stroke or two with a sticky roller for pet hair removes it.

Yeah, or just use some sticky tape to remove dust and the like, that works well with fabrics.

The difference being that when all the gear is set up and the lights are on, and you want to make a final pass to remove dust, a roller won’t lift the fabric like blotting with tape will.  Been there and it’s a pita.  :)

2
Gemstone Faceting / Re: Photographing faceted stones.
« on: August 17, 2020, 05:45:16 PM »
...but dust, fluff are a pain...

A stroke or two with a sticky roller for pet hair removes it.


3
Gemstone Faceting / Re: Photographing faceted stones.
« on: August 17, 2020, 04:05:33 AM »
Black Duvetyne reflects very little light.
https://tinyurl.com/y2fmatyy

Might be available locally.  Amazon.AU doesn’t have it but their US site does https://tinyurl.com/y2fxenpy

4
Gemstone Faceting / Re: Photographing faceted stones.
« on: August 14, 2020, 09:28:30 AM »
With the camera mounted on a solid tripod, use 5000 Kelvin spot lighting positioned to shine from behind the camera. Use a no-shine dark or black background under the stone. To get professional quality, take multiple images of the stone (without moving it or the camera) taken at various points of manual focus. Use an image stacking app to combine the photos to create a completely focused image throughout the depth of field.

Without the software, shoot at a closed-down aperture to increase depth of field. Experiment within the f/11 to f/22 range (too small of an aperture creates star sparkles). You will have to determine what point on the stone you want primarily in focus. The shots will required extended exposure times. Do not simply bump up the ISO to correct this, it can degrade the photo quality. Again, experiment because a camera’s sensor and internal processing software varies between brands and models. 

Lightboxes create opacified light from all directions and tend to kill a stone's brilliance. They are best used for detailed objects when you don’t want shadows. But, soft surrounding light from a lightbox combined with the 5K main light mentioned above is a good handshake.

When you buy lightbulbs, check their Kelvin rating because it affects the color of the photo.  You can tweak a photo’s white balance in an editing program for minor corrections, but adjusting one thing tends to influence another.  No free lunch.  :)

Kelvin guide
https://tinyurl.com/yxtlfpg6

5
Gemstone Faceting / Re: UltraTech VL
« on: February 02, 2020, 07:25:58 PM »
Looking forward to your feedback.  I've been all over their website and found no tech support link nor operator manual PDFs for any of their machines.

6
Gemstone Faceting / UltraTec VL
« on: January 23, 2020, 07:03:54 AM »
Has anyone seen or heard anything, or handled the new UltraTec VL Classic?

7
FWIW:
My first faceting machine was a platform design.  The ability to lift the handpiece and closely examine the cut was appreciated.  It became clear why platforms are popular in production mills.  As I discovered, though, it was also necessary because obtaining meet points with such a machine required frequent adjustments and fiddling.  Initially the routine was fun, but it evolved into a frustrating hassle which prompted me to change to a second-hand mast machine.  The purchase cost and calibration check were spendy but quickly forgotten after seeing the results.

8
The Gearloose Darkside lap with their 60K Diastik should do a fine job. Jon has said it will polish anything. I've used the combination to replace Cerium oxide. Don't irrigate the lap. Instead, mist it with a spray bottle and run it almost dry.  Apply just a couple of dabs of the crayon at a time, and refresh as needed.  It polishes fast, you can jump to it from a 1200.

When new the Darkside's surface seems too rough, but other than being noisy at that stage it works fine.  After a couple of stones it will smooth nicely.

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