Digital BW, The Print

Earnest,

Have you seen the link on this page yet?

http://groups.yahoo.com/group/WETMOUNTING/message/656

A lot of technical information that I think a lot of people here may 
be interested in.

Most of it is too technical for me, but I like the section on films 
asigning a ddi number and resoulution and what not.

Scott


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Ernst Dinkla 
<E.Dinkla@...> wrote:
>
> Greg wrote:
> > --- In 
> > DigitalBlackandWhiteThePrint@yahoogroups.com, "scott_now_coming" 
> > <scott_now_coming@> wrote:
> >> I think it comes down to price vs quality: value.
> >>
> >> For $800 for a scanner like the V-750 that will scan up to 8x10" 
> >> films up to 6400 dpi, how can you go wrong?
> >>
> > 
> > 
> > All I know is that I'm in the market for a new flatbed scanner, 
and 
> > I'm not doing anything until the v750 reviews come out, and maybe 
> > some time after that. I still have to wonder if the 6400ppi is 
going 
> > to be real or the normal over inflated value that Epson is pretty 
> > well known for.
> 
> I expect that the Epson V750-M will have a true resolution 
> somewhere between 3000 and 4000. probably closer to the 3000 
> side. That isn't much lower than the 3600-3800 of the Nikons. 
> The Dmax and dynamic range may proof to be equal to the Nikon 
> 8000-9000, the older Epson models already came close in German 
> ISO tests. The tube light source may result in more flare + 
> noise, on the other hand the oversampling + the tube light 
> source may prove to be nicer for B&W grain. Signal/noise can 
> only be measured in a good ISO test and there's a relation 
> between S/N and available resolution / film size when printing 
> big sizes. Noise doesn't always show in the print.
> 
> The focus issue is one thing to check. With wet mounting you 
> can reasonably well keep the (larger) film flat and at the 
> right focus distance from scan to scan. That focus finding 
> should be better than the 3 choices Epson hardware gives. 
> There's something I worry about more, if the scanner has done 
> several scans and warmed up I would like to know what changed 
> in the focus distance. The former models had a plastic shell 
> and the engineering had the sensor, traction etc fastened to 
> the bottom on a metal plate. The glass is at the top of the 
> plastic shell. It wouldn't surprise me if the 8 cm height of 
> the shell gives a focus shift of 0.5 mm after 20 scans. The 
> V700 etc seems to have a metal shell which would make it 
> better. There are some other ways to compensate temperature 
> influences. Without active focusing this becomes a thing to 
> control. I have seen some neat designs where the sensor 
> carriage actually rides against the glass (springs for some 
> pressure)  to keep the distance equal to the original. That 
> was on a cheap reflective scanner.
> 
> 
> Ernst
> 
> -- 
> 
>                     --
>            Ernst Dinkla
> 
> 
> www.pigment-print.com
> (         unvollendet         )
>