LaserSoft Imaging

Reading the specification suggests that it is 4800 dpi.
But somebody told me that this is not correct.
Considering hat it has two sensors ( one for reflective and the other for transparency ) , what is teh correct optical resolution for each.

I would suggest taking a look at the Epson webpage:
http://content.epson.de/product/imaging ... /index.htm


kind regards,
Arne Ketelhohn.

Thanks.
But I was asking more from a practical silverfast point of view.
I was told that there is no point in going to 6400 dpi because its stepper motor is not capable of doing that kind of increments.

SilverFast gets it's values directly from the scanner's driver.
The only exception is the last and largest value.
This is an interpolated resolution at twice the maximum hardware resolution.
It allows the creation of larger scans for large format printing up to that resolution value.
But the interpolated resolution does not gather more image data during scanning.

kind regards,
Arne Ketelhohn.

Thanks again for the precise answer.
"This is an interpolated resolution at twice the maximum hardware resolution"
I did not know the last value was twice the maximum hardware resolution.
But if that is true, then why is the last value always showing 9600 for Epson V700, no matter whether I select 'Transparency' or ''Wide Transparency'?
I though 'Transparency' chooses the high resolution CCD ( 6400 dpi )
and 'Wide Transparency' Chooses low resolution CCD ( 4800 dpi )
If thats true the teh last value shoudl have shown 12800 for Transparency and 9800 for Wide Transparency
Or maybd I understood that wrong ?

Yes, you are right that is a bit different.
We use the 9600dpi for both because 12800 generates so dramatically large images that most systems would not be able to handel the load.

kind regards,
Arne Ketelhon

Reading from differnt threads here, I understand that for Epson v700 and Silverfast 8 Plus..
1. When you choose 'Reflective' in Silverfast you use the low resolution CCD ( Optical res 4800 dpi )
2. When you choose 'Transparency ' in Silverfast you use the High resolution CCD ( Optical res 6400 dpi ) with teh focal plane 3.5 mm above the glass.
3. When you choose 'Wide Transparency ' in Silverfast you use the same High resolution CCD as the one in 2. above ( 6400 ) *but* with teh focal plane at teh same level as the glass.
Is my above understanding correct ?

Here are the common resolutions I use for archival purposes by film format:

- 35mm / up to 6400ppi
- 120 / up to 4800ppi
- 4x5 / up to 2400ppi

Notice I say "up to" as every image will not benefit from these resolutions. It depends on the film type, format, emulsion, image focus, etc.

80% of my archive is 120 format transparencies, which I scan at 3200ppi; 10% are scanned at either 2400ppi or 4800ppi; the remaining 10% of my work is 35mm, which is scanned at either 4800ppi or 6400ppi.

Hope this helps!

TG

This site, which has many scanner reviews, suggests the optical resolution of the V700 is 2300dpi.

http://www.filmscanner.info/en/EpsonPerfectionV700Photo.html

I scanned the Silverfast resolution target on my V700 at 3200 dpi

http://www.rickthurmond.com/EpsonV700.tif
The vertical stripes looks like group 5 element 4(2229) or 5(2580), and the horizontal stripes group 5 element 2 (1825) or 3 (2048). I use a BetterScanning.com glass holder, carefully adjusted for height.

For comparison, my Nikon Coolscan V ED film scanner
http://www.rickthurmond.com/NikonCoolscanVED.tif
shows group 5 element 5 or 6 in both dimensions

I wouldn't scan 35mm on this scanner, it loses too much. It is fine for medium and large format. I have a 30x38 print I made from a 4x5 using the scanner, and it looks fine until you get really close.

For sure the advantage of this scanner over sending your film out for drum scans is color calibration, which you can do with the IT-8 target and the Studio version of the software. But if you need to extract every detail from medium or large format film a drum scan is the way to go, and for 35mm, a film scanner like the Nikon is the way to go. Finally with version 8 the iSRD works on this scanner. That alone is worth the upgrade price.

rickthurmond wrote:I wouldn't scan 35mm on this scanner, it loses too much.

Not sure I agree with this statement. I've exhibited and sold 16"x24" prints from 35mm scanned on my V750 without issue. Yes, the files look different (softer?) from those scanned on a Nikon, but the Nikon film scanners are no longer being produced, and the jury is still out on the new offerings by Plustek and PrimeScan. It has been my experience that 35mm scanned at 6400 and then processed in HDR Studio using Silverfast's Auto Sharpen produces a file which is virtually indistinguishable from the Nikon at nominal print sizes.

Are the following correct with respect to Silverfast 8.0 and Epson v700 ?
1. When you choose 'Reflective' in Silverfast you use the low resolution CCD ( Max Optical res 4800 dpi )
2. When you choose 'Transparency ' in Silverfast you use the High resolution CCD ( Max Optical res 6400 dpi ) with teh focal plane 3.5 mm above the glass.
3. When you choose 'Wide Transparency ' in Silverfast you use the same High resolution CCD as the one in 2. above ( 6400 max ) *but* with teh focal plane at teh same level as the glass.
Is my above understanding correct ?

Hi Norris

norris_watkins wrote:Reading the specification suggests that it is 4800 dpi.
But somebody told me that this is not correct.
Considering hat it has two sensors ( one for reflective and the other for transparency ) , what is teh correct optical resolution for each.

I believe it has a dual lens system (not sure about the two sensors though). This is automatically set by the scanner driver at the moment of choosing transparency or reflective as well as giving the resolution.

Kind regards

Thanks.
I thought if it is the same CCD, then the maximum optical resolution will be same.
Since there are 2 maximum optical resolutions, then I reached teh conclusion that there would be two different CCDs