68degrees
Well-known
are these the same thing? Thanks.
Is Anti Newton Ring Glass the same as Tru Vue Museum Glass?
- Thread starter 68degrees
- Start date
- Latest activity Latest activity:
- Replies 9
- Views 762
Frank Petronio
Well-known
nope ~~~~~~~~
68degrees
Well-known
it seems like a gimmicky name. "Anti Newton Ring Glass" . What is the origin of this glass and the name I wonder. Is this a name that has been coined recently with the scanning of film? What is the technical name and original purpose for this glass I wonder.
Phil_F_NM
Camera hacker
http://physicsed.buffalostate.edu/pubs/StudentIndepStudy/EURP09/Ring/rings.html
ANR glass interrupts this phenomenon. Newton rings are analogous to the rainbow colored bands you see in soap bubbles. There is a repetition of pattern with the doubling of the bubble's thickness with respect to the harmonic of the particular wavelength you're looking at. This is similar to Newton Rings but the medium which the light passes through causing the rings is air instead of a soap mixture.
Phil Forrest
Sejanus.Aelianus
Veteran
Newton's Rings and film are a long standing issue. ANR glass was a big selling point on enlargers in the 'fifties and 'sixties, until glassless carriers became popular. My Phillips 150 has a glass carrier with ANR glass both top and bottom, though it is really only needed on the top surface; the emulsion is usually rough enough to prevent the problem.
If you look at a sheet of ANR glass from a very oblique angle, it has an odd milky appearance on the treated side but the normal appearance on the untreated side.
The whole Newton's Rings thing is one of those phenomena that seems almost random. I remember printing a particular negative several times without trouble and then it suddenly developed odd "shadow" patterns on the print, which was when I realised I had put the top glass back the wrong way up, after using a glassless carrier for a job.
If you look at a sheet of ANR glass from a very oblique angle, it has an odd milky appearance on the treated side but the normal appearance on the untreated side.
The whole Newton's Rings thing is one of those phenomena that seems almost random. I remember printing a particular negative several times without trouble and then it suddenly developed odd "shadow" patterns on the print, which was when I realised I had put the top glass back the wrong way up, after using a glassless carrier for a job.
ivan28
Newbie
Antin newton technology
Antin newton technology
I don't know anything about Tru Vue museum glass, but I'm quite sure that an Anti Newton Rings Glass is a glass etched with an acid treatment (Hydrofluoric acid).
The treated surface become opaque, with a very smooth finish, and in this way will not "stick" with the film surface and will not show Newton Rings.
Don't confuse with sandblasted glass, which has an opaque surface too, but rough, not as smooth as the acid-treated glass.
I think that acid-tratment is a quite common treatment in glass working. In a glass shop in my little city (in Italy) I asked for 2 glass insert for my flatbed scanner (similar to those sold by bettercanning.com in my idea) and they had no problem making those in few days (and for about 5 euros each, so they are also not so expensive).
As Phil and Sejanus said, these glass are mostly used when you need a glass to be in contact with film (like for enlarger without a free-glass negative holder or for film scanning with a flatbed scanner).
Ivan
Antin newton technology
I don't know anything about Tru Vue museum glass, but I'm quite sure that an Anti Newton Rings Glass is a glass etched with an acid treatment (Hydrofluoric acid).
The treated surface become opaque, with a very smooth finish, and in this way will not "stick" with the film surface and will not show Newton Rings.
Don't confuse with sandblasted glass, which has an opaque surface too, but rough, not as smooth as the acid-treated glass.
I think that acid-tratment is a quite common treatment in glass working. In a glass shop in my little city (in Italy) I asked for 2 glass insert for my flatbed scanner (similar to those sold by bettercanning.com in my idea) and they had no problem making those in few days (and for about 5 euros each, so they are also not so expensive).
As Phil and Sejanus said, these glass are mostly used when you need a glass to be in contact with film (like for enlarger without a free-glass negative holder or for film scanning with a flatbed scanner).
Ivan
68degrees
Well-known
nice thanks.
sevo
Fokutorendaburando
AN glass between film and lens reduces sharpness significantly, so that it can only be used as the top glass, except for very modest magnifications. 35mm black and white film usually has a bare acetate back, while the emulsion side has enough texture to be invulnerable to Newtons rings so that AN top, flat glass bottom is a suitable combination for that purpose. Colour film (where both sides are equally glossy flat so that rings could form on the lens side as well) was usually printed with glassless holders or glassless bottom, AN top.
For large format (where the size mandates the use of glass holders) labs sometimes used traces of lycopodium powder to separate film and glass - this will also break AN rings, without affecting sharpness, but the film needs to be cleaned after printing.
Oren Grad
Well-known
Usually. I sometimes get Newton's rings from the emulsion side of TMX.
noisycheese
Normal(ish) Human
Here is the story on the Tru Vue glass -
Totally different glass from ANR glass...
Link: http://www.tru-vue.com/products/museum-glass-anti-reflective
Totally different glass from ANR glass...
Similar threads
