End usage likely an issue of base thickness. Save for
Originally Posted by maxbloom
the RA line/half tone films there are no LITH films perse.
A lith developer is needed to produce lith results which
need not be high contrast results. Lith prints often
have a pictorial gradation.
I detect some confusion and it is due to terminology.
Lith, half-tone, graphic art, line, ortho, process. Any
of several films can qualify for all those descriptives.
For example I just went Google for, Soemarko LC-1
Developer. Specifically the article deals with APH and
APHS; Half Tone and Half Tone Supreme LITH films. His
developer; pictorial results from those, general category,
graphic art films. Worth a read. Dan
It really is only in recent years that the "terminology" has become confusing, as back in the 1970's and 1980's, the only thing we used ortho/litho film for, was making high contrast images, such as line art for title slides, masks for background dropouts, and "high contrast conversions" of continuous tone originals for graphic design effects. I always used Kodalith A & B developer, which was a very active BLACK AND PURE WHITE DEVELOPER.
Now that "Lith" means a type of printing technique with specific developers and papers, the classic understanding of these thin emulsion ortho sensitive films is misunderstood, I think.
In general (with few exceptions) an "Ortho" film as available today is a thin emulsion (not necessarily thin base) orthochromatic sensitive film designed for high-contrast work, using specific developers designed to enhance this effect.
HOWEVER, you CAN get full toned results from these same films by developing them in soft-working (as compared to normal for these films) developers. Most b/w film developers for common films would be considered "soft working" in the context of using them for Ortho film.
Full toned results. Another article worth a read is
Originally Posted by PHOTOTONE
at Unblinking Eye. At Google enter, aphs less is more .
BTW, Thin vs thick. The process camera I worked
with had a Sticky Back. Some have vacuum backs.
That may be a reason for base variations. Dan