ASET Princess pictures, just for fun

[Garry H (Cut Nut)]

For others benefit, Sergey is referring to the angular size of the "peep hole".
Notice that the extra darkness caused by the peeop hole being larger changes the tone of the green, and is an additional source of darkness that can be confusing. Black in the ASET is to represent leakage.
The hand held ASET has a 2 degree peep hole, and I believe the desk top also has a 2 degree aperature.

In this image the shiny bule part is over exposed and is not 'blue', and the peep hole is white - but when your eye covers the lens it is dark to black as.

 

[denverappraiser]

Date: 10/3/2005 8:09:39 AM
Author: Garry H (Cut Nut)
For others benefit, Sergey is referring to the angular size of the ''peep hole''.
Notice that the extra darkness caused by the peeop hole being larger changes the tone of the green, and is an additional source of darkness that can be confusing. Black in the ASET is to represent leakage.
The hand held ASET has a 2 degree peep hole, and I believe the desk top also has a 2 degree aperature.

In this image the shiny bule part is over exposed and is not ''blue'', and the peep hole is white - but when your eye covers the lens it is dark to black as.

In the photographs, the tone of the green and other colors has a great deal to do with the settings on the camera. In my photos, I''ve taken off the blue piece of the ASET and replaced it with one that doesn''t have a lens in it so that I''m using the optics of the camera directly. I didn''t put much thought into the size of the ''peephole'' but I suspect it''s a little bigger than the original, unmodified tool.

Belle,
Thanks! Anybody else what to play?

Neil Beaty
GG(GIA) ISA NAJA
Professional Appraisals in Denver

 

[Garry H (Cut Nut)]

Neil you can unscrew the cap and remove the lens.

Do you see that if you have too much darkness it can change the effects you see.

 

[denverappraiser]

With the pictures here, there is a space between the pink and blue areas and the substitute blue plate is much larger. The effect is that more light gets on the blue plate, sort of like the white plate on an H&A viewer. This increases the brightness of the blue in the image without changing any of the angles (except maybe the peephole,which I didn't consider). It makes it much easier to see the difference between the blue and black areas, which seems to be a problem with most photos.

Neil Beaty
GG(GIA) ISA NAJA
Professional Appraisals in Denver

 

[denverappraiser]

Ok y’all. Here’s a picture of the getup I used to take the pictures. Be nice, this is strictly for learning how to take good ASET photos. Besides, it’s not nice to make fun of Rube Goldburg type tools unless you can take better pics with something else.

The peephole in mine is about 7 degrees. I can easily make it smaller if it would help. By the way, on a stock handheld ASET it’s 4.9 degrees.

It’s made with a standard handheld ASET with the blue portion removed. It just snaps off. I took a clear plastic stone box and drilled a hole in the bottom exactly the size of the ASET ant it snaps in quite nicely where the metal piece used to be. The inside lid of the stone box is painted blue with a 5mm hole in the center. The opening of the cone is covered with saranwrap, which is held tight with the rubber band. I set this directly on the lens of my camera facing upward and rest the stone table down on top of the saranwrap. The whole thing rests along the rim that holds the camera lens and blocks out the side light fairly well. The Pen cap sits over the stone to block out the transmitted light. I take the picture as a time delay so that there is no movement from pushing the button and I light it with a small lightbox handheld above it.

Neil Beaty
GG(GIA) ISA NAJA
Professional Appraisals in Denver

 

[Rhino]

Very cool Neil.

 

[Garry H (Cut Nut)]

Ingeneous Neil

The smaller the hole the better.
I do not have one here at home, but from memory the hole is 2mm and at about an inch from the stone that would be 5 degrees (not 2 as I said before).

This ideal-scope shot shows why the leakage and the obstruction from the peep hole can be confusing. Note that leakage and obstruction both result in darkness in the actual stone (unless you are GIA and semi back light your stones). So the more darkness you have from the peep hole, the less you know about what is really going on in the stone.

 

[denverappraiser]

Garry,

It''s got a 3mm aperture and it rests 35mm from the opening of the cone - 4.91 deg. That said, is the objective to match what they have or should I really go as small as possible? After I figure out what I am doing, I will probably just attach it to an inexpensive pinhole style camera anyway and I can make the hole quite small. Any idea what the size of the viewing hole is on the tabletop unit?

The transmitted vs. blocked light thing is an interesting question. As I mentioned in my prior to post to Rhino, the blocked light approach is considerably more useful for mounted stones and it would clearly be better for my uses if all ASET photos took this approach so that they could be compared after the stone is set. This seems to be what’s being encouraged by AGS with the tabletop model as well, possibly for the same reason, although maybe it’s just because it makes the image look better. Since there’s a lot of light on the front and none on the back, I can probably arrange a blue reflective filter plate and eliminate the hole entirely if it’s desirable.

Neil Beaty
GG(GIA) ISA NAJA
Professional Appraisals in Denver

 

[Garry H (Cut Nut)]

Here is an Ideal-Scope of that same leaky stone without a back light.