Change scanner glass Epson V750 to anti newton

[jsch]

Hi,

I plan to change the scanner glass in my Epson V750 to an anti newton glass, because I use it only to scan 8x10 inch film. I found the attached drawing. I guess no. 109 is the scanner glass, does anyone know the exact measurements and the thickness of this glass? Thank you.

Best,
Johannes

[Walter Calahan]

Sounds like a good idea.

I simply flip my 8x10 emulsion up, and place an anti-newton ring glass on top. 99% I get no newton rings.

[jsch]

Sounds like a good idea.

I simply flip my 8x10 emulsion up, and place an anti-newton ring glass on top. 99% I get no newton rings.

Which side of the neg do you put on the scanner glass? In my experience the emulsion side gives less trouble with newton rings. To keep the film flat I put a second anti newton glass on top of the film.

Best,
Johannes

[Leigh]

Anti-newton glass should be used in contact with the smooth (non-emulsion) side of the negative. That's where the Newton rings appear.

But the glass in the V750 lid doesn't touch the negative in the first place, so there should never be any Newton rings in the scan.

An anti-NR glass on top of the negative to keep it flat would be in addition to the glass installed in the lid, and would not interfere with it.

- Leigh

[Gem Singer]

The Epson V750 scanner is designed with the sensor in the bottom section and the light in the top section.

Replacing the clear scanner glass with anti-Newton glass will result in sensor needing to read through the textured (lightly frosted) anti-Newton glass before it reads the negative.

Your scans will not be sharp.

It's the wrong thing to do.

[Peter J. De Smidt]

A Screen Cezanne scans through an anti-Newton textured bed. According the Seybold Report, the Cezanne is capable of capturing about 6000 spi. It's not intuitive, and so I tested it by replacing the textured bed with optical glass. When I wet-mounted film to the clear glass using Kami, there was no increase in scan quality over using the textured scanning bed.

[Gem Singer]

Peter,

Bob McCarthy's Screen Cezanne has a fixed sensor above, with the light coming up from the bottom. The opposite configuration of the Epson V750.

During scanning, the bottom section with the light moves while the sensor in the top section remains stationary. The Screen Cezanne's sensor reads the negative first, then passes through the textured anti-Newton glass.

The AN glass does not come between the sensor and the negative.

Un-like the SC, both the light and the sensor move during scanning with the V750.

[Leigh]

I guess my previous post wasn't clear, so let me try again...

The light is in the lid. It passes through the negative, emulsion down, then into the lower housing where the optics and sensor are located.

It would only make sense to put an anti-NR glass above the negative. If you put it below, the texture of the glass would degrade the image.

- Leigh

[Peter J. De Smidt]

Hi Gem,

Well, I have a Cezanne, and I guarantee you that the lens and sensor are in the bottom (below the bed.) I know that because that's what it says in the manual, and because I've opened up the scanner. The lights sources do not move. The whole bed with the negative moves, which is the reason for the huge wing to the scanner's left. With a transparency, the upper bulbs are used. They shine down through an anti-newton cover plate, the negative, the anti-newton bed, and bounce off of a mirror into the lens, which focuses the light on the sensor. I've removed my bottom bulbs since I only scan negatives and not reflective media.

In any case, a Screen clam-shell holder is textured on both interior surface, the one below and above the negative. I'm looking at one right now.

Also note that some excellent traditional printers, such as Howard Bond, use AN glass both above and below the negatives in their enlargers, since some contemporary films have very shiny emulsion sides, as well as shiny base sides.

[Bob McCarthy]

Eugene, the lamps are above and the sensor is beneath the moving table. Maybe you were thinking reflective scanning where the lower lamps are lit.

The sensor reads through the sandwich = anti newton acrylic below - film - hold down clamp acrylic above

Bob

Peter,

Bob McCarthy's Screen Cezanne has a fixed sensor above, with the light coming up from the bottom. The opposite configuration of the Epson V750.

During scanning, the bottom section with the light moves while the sensor in the top section remains stationary. The Screen Cezanne's sensor reads the negative first, then passes through the textured anti-Newton glass.

The AN glass does not come between the sensor and the negative.

Un-like the SC, both the light and the sensor move during scanning with the V750.