Re: continued solarplate notes

[Jon Lybrook <jon@terabear.com>]

Christina Z. Anderson wrote:
> If he's using the Dan
> > Welden screen and imagesetter positive, the density of both those 
> > things is so great he could probably do 15 minute exposure times and 
> > get away with it.
> I used Dan Welden screens and also Elizabeth Doves and didn't find 
> that Weldens was so dense (?)
So Chris, are you saying the Welden screen had less density than 
Dove's?  Do you mean the dots themselves are less dense or the space 
between the dots is broader?  Difference between an 80% density screen 
and a 90% in this process is the space between the dots.  The dots 
themselves ought to be as black as they can be in either case.

My point was that if the positive this gentleman is using is an 
imagesetter positive it will have a better chance of standing up to a 
point source light of such intensity for 15 minutes and would have the 
added benefit of having the effect of smaller dots as the edges get 
burned out.  Smaller dots=finer matrix to make up a wider number of 
tones, perceptually.  This is the reason why I use the custom screens I do.

Cheers,
Jon