Saran Film. was: RE: my first van dyke!!

I have to withdraw my comments on Saran Wrap: that it caused unsharpness in my set-up. Last night I had the change to do some printing (unfortunately these sessions are very infrequent).

When doing some Ziatyping I could not detect any unsharpness by eye when using Saran Film between the paper and the negative. Which is very nice, especially when doing Ziatype, were you want to have a high humidity level in the paper.

Not sure were I based my conclusion of introducing unsharpness with Saran on. Looking back in my early results it might have been that I have printed these Saran tests with a reversed negative, so the unsharpness, which is significant, was caused by the emulsion sides of the neg and the paper not facing each other, not by the Saran film (blush..)

Oh the Saran film I use is called 8E Clear, and has a Gauge of 50GA (if that's a measurement of thickness, I thougth it was used for the diameter of needles), how would that translate into mm?

Best,

Cor

> -----Original Message-----
> From: Dan Burkholder [mailto:fdanb@aol.com]
> Sent: dinsdag 11 oktober 2005 18:08
> To: alt-photo-process-l@sask.usask.ca
> Subject: RE: my first van dyke!!
>
>
>
> As I mentioned in my first post about using the Mylar, I use
> "a fairly
> collimated source." It's a mercury vapor source mounted two
> feet above
> the vacuum frame. No doubt, the combination of vacuum contact
> along with
> the semi point-source light minimizes any image softening from the
> 0.002" Mylar sheet. Still, I've seen students use it with fluorescent
> sources with no problem. Guess the best advice is to try it
> and see if
> it works for your conditions and materials.
>
> I actually talk about image softening as related to light
> source and dot
> structure on page 172 of the second edition of "Making Digital
> Negatives." There's a nice illustration that helps explain the effect
> too. ;^)
>
> Hope this helps!
>
> Dan
>
> Breukel, C. (HKG) wrote on 10/11/05, 9:22 AM:
>
> > Do not know about other materials, but I tried Saran wrap
> (have to dig
> > up the width, pretty thin I would say), but on smooth surface paper
> > like Simili Japon I always saw a decrease of sharpness,
> enough to not
> > use it again, and run the risk of damage my negative (none so far,
> > only a stepwedge)
> >
> > best,
> >
> > Cor
>
>
> --
> www.danburkholder.com
> www.tinytutorials.com
>
>
Received on Wed Oct 12 02:43:08 2005